小学分数方程专项练习180题(共33页).doc

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1、精选优质文档-倾情为你奉上 专心-专注-专业 分数方程专项练习180题(有答案)(1)+X=,(2)X=,(3)x+x=42,(4)=,(5)5x3=,(6)x+=,(7)+2x=,(8)12(x+)=1.2,(9)(10) (11)X2=45, (12)XX=,(13)90+x=20,(14)0.2x+=8x,(15)X+(3X16)=10(X+1),(15)=,(16)XX=1,(17)x+x=42(18),(19)=1,(20)2X+1=2,(21)x= (22)x+2=4.25 (23)x(1+)=4.5(24)37.5+x=69 (25), (26)x=2.45,(27)x+=,(2

2、8)x+x=121,(29)(x+)7=8.1,(30)=,(31)4x+=5, (32)+x=9,(33)xx=,(34)x+x=11,(35)2x+=4.625,(36)2X=,(37)xx=2,(38)+21.5=x,(39)3x=,(40)+x=,(41)x+54=95(42)xx= (43)3=,(44)xx=0.2, (45)y4y=18,(45),(46)3+2.75x=,(47),(48)5x3=,(49)x=, (50)x+x=39,(51)7x3x=,(52)x+=,(53)=,(54),(54),(55)5x=34(56)x6=(57)x+1.2x=25(58)84.5x

3、=,(59)x0.954=8.5, (60)2x=2+,(61)x+x=,(62)x=2,(63)=2.5,(64)x=18,(65)x=,(66)xx=,(67),(68), (69)xx=,(70)1.25:0.25=,(71)1x=,(72)x+x=,(73)x+x=42,(74)x+0.25=,(75)x=10,(76)x+x=2,(77)x(137.5%)=,(78)(x+)=2,(79)x=50,(80)x+x=42,(81)4+x=102,(82)X+X=, (83)X=,(84)(1)X=,(85)=,(86)=42,(87)8x3=,(88)+=1,(89)3x=50%,(9

4、0)3xx=,(91)+x=,(92)x=,(93)x=0.8,(94)x+54=95,(95)xx4=18,(96)=,(97)x=4,(98)=,(99)6=7,(100)+5x=110,(101)x4=60,(102)xx=9,(103)xx=3.6,(104)x=(105)=9.1,(106)4(+x)=,(107)0.25+x=,(108)x+x=,(109),(110),(111)+3x=,(112)=,(113)X=,(114)x=30,(115)x=7,(116)x=10,(117)XX=6,(118)X2=13,(119)(1)X=480,(120)6X+X=39,(121)

5、2.4=3.2x,(122) ,(123),(124)XX=,(125)6X+4.5=,(126)80%X0.6=4.2,(127)X+X=,(128)X+X=,(129)x=,(130)x=42,(131)x+=,(132)X=,(133)X+X=3,(134)X+=8,(134),(135),(136)x7.5=,(137)2X+=1,(138)X=,(139)XX=1.5,(140)x=28,(141)(x+3)=48,(142)x=,(143),(144)2x=2,(145)34x=2, (146)x= (147)x=(148)X25%X=135,(149)X12.54=0,(150)

6、x+=1,(151) x()=,(152)81.5x=1.1,(153)xx=2,(154)x=, (155)xx=15,(156)X=,(157)(X)=,(158)X+X=,(159)x=,(160)x+0.75=0.15,(161)2x+=4.625,(162)4.8x=15.8,(163)x=14,(164)x+x=2.1,(165)2.7120%x=9,(166)(13X)=6,(167)x21=4(168)1x+x=(168)x()=(169)2+x=5,(170)4x=;(171)x=(172)xx=3(173)6x3.5x=(174)3X=(175)(176)5X3(177)x

7、=5(178)=,(179)+=,(180)x=(181)x+15=40(182)x=专项练习参考答案:(1)+X=, +X=, X=;(2)X=, X+=+, X=;(3)x+x=42, (+)x=42, x=42, x=42, x=36;(4)=, 4.5x=8,4.5x4.5=84.5, x=(5)5x3=, 5x,5x, 5x5=, x=0.7(6)x+=,x+=, x=, x=, x=;(7)+2x=,+2x=, 2x2=2, x=;(8)12(x+)=1.2,12(x+)(x+)=1.2(x+), 1.2(x+)=12, 1.2(x+)1.2=121.2, x+=10, x=9(9

8、) x=, x=4, x=;(10) , 3x+=+, , 3x3=3, (11)X2=45, X=20, X=20, X=15(12)XX=, (1)X=, X=, X3=3, X=(13)90+x=20, 15+x=20, 15+x15=2015, x2=52, x=10;(14)0.2x+=8x,0.2x+x=8x+x, 1.8x+=8, 1.8x+=8, 1.8x=7.2, 1.8x1.8=7.21.8, x=4(15)X+(3X16)=10(X+1), X+(3X16)4=10X+10, X+12X64=10X+10, 13X64=10X+10, 13X64+64=10X+10+64

9、, 13X=10X+74, 13X10X=10X+7410X, 3X=74, 3X3=743, X=(15)=, +2x=+2x, +2x=, +2x=, 2x=1, 2x2=12, x=0.5(16)XX=1, ()X=1, X=1, X2=12, X=2;(17)x+x=42(+)x=42 x=42 x=42 x=36(18), =, =, =, =, =, x=(19)=1,()6=16, 4x+23x+3=6, x+5=6, x+55=65, x=1(20)2X+1=2,2X+1=2, 2X2=2, X=(21)x= x= x= x=;(22)x+2=4.25 x=4.252 x=42

10、 x=32 x=1;(23)x(1+)=4.5 x(1+)=4.5 x1=4.5 x=4.5+1 x=4+1 x=4+1 x=6;(24)37.5+x=69 37.5+0.2+x=69.5 37.7+x=69.5 x=69.537.7 x=31.8(25), , , , x=18(26)x=2.45, x6=126, x=72;(27)x+=, x=, x=, x=(28)x+x=121,x=121, x=132;(29)(x+)7=8.1, 7x+6=8.1, 7x+66=8.16, 7x7=2.17, x=0.3;(30)=,3.6=3.6, x=15(31)4x+=5, 4x+=5, 4

11、x4=, x=;(32)+x=9,+x=9, x=;(33)xx=, x=, x6=6, x=5;(34)x+x=11, x=11, x=11, x=(35)2x+=4.625, 2x+=4.625, 2x=4, x=2,(36)2X=,2x+2x=+2x, =2x, 2x=, x=,(37)xx=2, x=2, x=2, x=;(38)+21.5=x, 22=x, 22=x x=(39)3x=, 1448x=11, 48x+11=14, 48x+1111=1411, 48x=3, 48x48=348, x=;(40)+x=, 3x+1=2, 3x+11=21, 3x=1, 3x3=13, x

12、=;(41)x+54=95 x+20=95 x=9520 x=75 x=75 x=125(42)xx=, x=, x=, x=;(43)3=,3+3x=+3x, 3x+=, 3x+=, 3x=, 3x3=3, x=(44)xx=0.2, ()x=0.2, x=0.2, x=8.4;(45)y4y=18, y4=18, y4+4=18+4, y=22, y=88(45),x=, x=;(46)3+2.75x=,+2.75x=,+2.75x=, 2.75x=, 2.75x2.75=2.75, x=;(47), 5x=4.8, 5x5=4.85, x=0.96;(48)5x3=, 5x=, 5x+=

13、+, 5x=, 5x5=5, x=(49)x=, x=, x=1.5;(50)x+x=39, x=39,x=39, x=24; (51)7x3x=, 4x=, 4x4=4, x=(52)x+=, x+=, =, x=;(53)=, ()x=, x=, x=, x=(54), 0.9+x=3.2x+x, 0.9+x0.9=3.20.9, x=2.3;(54), 4.5+2.75x4.5=4.5, 2.75x=1, 2.75x2.75=12.75, x=(55)5x=34 5x+=34+ 5x=34 5x5=345 x=6.95;(56)x6= x4.8= x4.8+4.8=+4.8 x=5.55

14、 x=5.55 x=18.5(57)x+1.2x=25 (+1.2)x=25, 5x=25, 5x5=255, x=5;(58)84.5x=, 84.5x+4.5x=+4.5x, +4.5x=8,+4.5x=8, 4.5x=4.5, 4.5x4.5=4.54.5, x=1;(59)x0.954=8.5, x3.8=8.5, x3.8+3.8=8.5+3.8, x=12.3, x=12.3, x=16.4;(60)2x=2+,(2x)2=(2+)2, 4xx1=4+x+1, 3x1=x+5, 3x1+1=x+5+1, 3x=x+6, 3xx=x+6x, 2x=6, 2x2=62, x=3(61)

15、x+x=, x=;(62)x=2, xx+=2x, x+=x, x+x=x+x,x=, x=, x=, x=1(63)=2.5,()12=2.512, 4x+83x+9=30, x+17=30, x+1717=3017, x=13(64)x=18, x=18, x=27;(65)x=, x+=+, x=, x=, x=;(66)xx=, x=, x=, x=(67), x=1;(68), x=, x+=+, x=2(69)xx=, x=, x=, x=;(70)1.25:0.25=, 0.25x=1.251.6, 0.25x=2, 0.25x0.25=20.25, x=8;(71)1x=, 1

16、x+x=+x, x+=1,x+=1, x=,x=, x=;(72)x+x=, x=, x=, x=(73)x+x=42, (+)x=42, x=42, x=42, x=36;(74)x+0.25=, x+0.25=0.25,x+0.250.25=0.250.25, x=0;(75)x=10,x3=3, x=;(76)x+x=2,(+)x=2, x=2, x=, x=;(77)x(137.5%)=, 0.625x=, x=, x=, x=1;(78)(x+)=2, x+=2, x+=, x+=, x=, x4=4, x=;(79)x=50, x=15, x5=155, x=75;(80)x+x=

17、42,(+)x=42, x=42, x=42, x=36;(81)4+x=102,4+x4=1024, x=98, x5=985, x=490;(82)X+X=, x=, x=;(83)X=, X+x=+x, =+x, x=;(84)(1)X=,x=, x=1(85)=, =, =, =3;(86)=42, =42, =42, =50;(87)8x3=, 8x=, 8x+=+, 8x=12, 8x8=128, x=1.5(88)+=1, x+2=4, x+22=42, x=2;(89)3x=50%, 3x=, 3x+=+, 3x=, 3x3=3, x=(90)3xx=, x=, x=, x=(

18、91)+x=,+x=, x=;(92)x=,x+x=+x,=+x, x=(93)x=0.8, xx=x, x=, x=, x=, x=, x=;(94)x+54=95, x+20=95,x+2020=9520, x=75, x=75, x=75, x=125;(95)xx4=18,(1)x4+4=184, x=14, x4=144, x=56(96)=, xx=x, x=, x2=2, x=;(97)x=4, x=4, x=5;(98)=,=, x=3;(99)6=7, 6+6=7+6, =13, 2=132, x=26(100)+5x=110, x+10x=220, 11x=220, 11x

19、11=22011, x=20;(101)x4=60, x4+4=60+4, x=64, x=192;(102)xx=9, x=9,x=9, x=30;(103)xx=3.6, x=3.6, x=3.6, x=4.8;(104)x= xx=x, =x, x=4;(105)=9.1, 7=9.17, x=63.7;(106)4(+x)=, +4x=,+4x=, 4x=4, x=1;(107)0.25+x=, 0.2+x=, 0.2+x0.2=0.2, x=, x=(108)x+x=, x=, x, x=;(109), , x=;(110), , x=90;(111)+3x=,+3x=, 3x=,

20、3x3=3, x=;(112)=, 4x=31.2, 4x=3.6, 4x4=3.64, x=0.9(113)X=, X=, X+X=+X, +X=, +X=, X=0(114)x=30, x=30, x=25;(115)x=7, ()x=7, x=7, x=7, x=20;(116)x=10, x=8,x=8, x=11;(117)XX=6, X=6, X=6, X=15;(118)X2=13, X2+2=13+2, X=15, X=15, X=40(119)(1)X=480, X=480, X=480, X=540;(120)6X+X=39, 6.5X=39, 6.5X6.5=396.5,

21、 X=6(121)2.4=3.2x, 0.9=3.2x, 0.9+x=3.2x+x, 0.9+x=3.2 0.9+x0.9=3.20.9, x=2.3;(122),x=7,x=7, x=;(123), +2.75x=, +2.75x=, 2.75x=, 2.75x2.75=2.75, x=(124)XX=, X=, X=, X=;(125)6X+4.5=,6X+4.54.5=4.5, 6X=2, 6X6=26, X=(126)80%X0.6=4.2, 0.8X0.6+0.6=4.2+0.6, 0.8X=4.8, 0.8X0.8=4.80.8, X=6;(127)X+X=, X=, X=, X=

22、(128)X+X=, X=, X=, X=(129)x=, x=, x=;(130)x=42, x=42, x=9;(131)x+=, x+=, x=, x=, x=(132)X=, X=, X=1, x=1;(133)X+X=3, x=3, x=3, x=3;(134)X+=8, X+=4, X=3, X=3, x=4(134), 3x6+6=8.25+6, 3x=15, 3x3=153, x=5;(135), (+)x=15, x=15, x=12(136)x7.5=,x7.5+7.5=+7.5, x=13.75,x=13.75, x=2.75(137)2X+=1, 2X+=1, 2x=,

23、 2x2=2, x=;(138)X=, X=, x=;(139)XX=1.5, ()X=1.5, X=1.5, X6=1.56, X=9;(140)x=28, x=32;(141)(x+3)=48, 0.5x+1.5=48, 0.5x+1.51.5=481.5, 0.5x=46.5, 0.5x2=46.52, x=93;(142)x=, x=, x=, x=, x=0.5;(143), 5x=3.28, 5x=25.6, 5x5=25.65, x=5.12(144)2x=2, 2xx=2x, 22=2x2, x=1;(145)34x=2, 34x+4x=2+4x, 32=2+4x2, 1=4x

24、, 14=4x4, x=0.25;(146)x= x=, x=, x=, x=;(147)x= x=, x=, x=, x=1(148)X25%X=135, 0.75X=135, 0.75X0.75=1350.75, X=180;(149)X12.54=0, X50=0, X50+50=0+50, X=50, X=50, X=250(150)x+=1, x+=1, x+, x, x=;(151) x()=, x=, x12=12, x=8(152)81.5x=1.1, 21.5x=1.1, 21.1+1.5x1.5x=1.11.1+1.5x, 1.5x=0.9, 1.5x1.5=0.91.5,

25、 x=0.6; (153)xx=2, x=2, x2=22, x=4(154)x=, x=, , x=;(155)xx=15, , x=24(156)X=, X=, x=;(157)(X)=,(X)=, x, x=;(158)X+X=, x=,x, x=(159)x=, x+x=+x, +x=,+x=, x=;(160)x+0.75=0.15, x+0.75+=0.15+, x+0.75=0.75, x+0.750.75=0.750.75, x=0;(161)2x+=4.625, 2x+=4.625, 2x=4, 2x2=42, x=2(162)4.8x=15.8,4.8x4.8x=15.84

26、.8x, 75.84x=, 75.84x75.84=75.84, x=;(163)x=14, x=14,x=14, x=12(164)x+x=2.1, x=2.1, x=2.1, x=1.2;(165)2.7120%x=9,2.71.2x1.2x=91.2x, 2.7=10.8x, 2.710.8=10.8x10.8, x=0.25;(166)(13X)=6, (13X)=6, 13X+X=8+X, 138=8+X8, X=5(167)x21=4 x14=4 x14+14=4+14 x=18 x=60(168)1x+x= x= x= x=(168)x()= x= x= x=8(169)2+x=5, 22+x=52, x=52, x=2;(170)4x=; 4x+=+;

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