1、 七年级数学上册一元一次方程七年级数学上册一元一次方程 243 一、解方程。#9 xx47 9x5x5 2 x19.5x3x2.5x10 23 6 3x x 15 x6.5x3 2.57 8 8 6x51412x 7x5.5x13 5 x8x9 x59x8 8 5 3 x5x x5x7x18 8 2 14x8x5x2 6y6y9y19 4.5y3.5y4y56 x6x8 y52y4 4x(7x6)9x3(x9)1 5 3 bbb 23 7x5(x9)83(x6)2 4 4 2(x9)3x 4x4(5x8)85(x4)73(x3)38(25.5x)5(x6)2x 1 1 9(x6)3x3(x9)
2、8y53y3 6 4 x3 4x 52 x2.5x14 2 6 x3 2x3 9x1 3(x5)5x 4 2 6a(16a)-1 5b(6b6)21 8x3(6x4)13 2y2(2y4)10 2(x5)7(x5)9x4(x3)6x3 3x9 6x3.5x6 4 6 2x8 7x7 5x3(x7)6 9 8y4 9y1 1 3(54y)(4y2)4 8 9y9 2y4 3y9 2 3(x6)8(x1)4 6 10 9x4 8x4 x8.5x9 3 7 4x8 6x3 7x4(x4)3 12 一、解方程。#1 xx26 3x6x4 4 x4.5x6x16.5x5 88 1 9x x 8 4x9.
3、5x8 1.56 8 2 x9611x 5x7.5x17 5 x9x2 2x76x8 2 5 1 x3x 3x8x2x12 4 4 4x5x7x19 y9.5y8.5y8 3y4.5y6.5y95 8x2x8 7y72y4 5x(6x6)4x5(x9)7 3 3 bbb 83 9x2(x9)65(x8)4 2 8 2(x1)3x 4x2(6x6)52(x9)53(x3)42(76.5x)4(x1)9x 1 1 4(x4)6x6(x5)y32y6 4 3 x2 2x 53 x3.5x12 3 6 x4 4x1 3x3 2(x1)6x 4 4 8a(67a)-1 8b(2b7)22 6x2(3x6
4、)19 6y4(3y6)9 3(x6)8(x4)3x4(x3)8x2 8x3 x2.5x15 4 7 5x8 8x1 3x9(x9)6 12 7y7 8y4 1 4(82.5y)(3.5y4)4 6 9y5 7y4 7y4 6 2(x1)7(x3)4 6 12 4x2 5x9 3x0.5x11 3 6 7x6 9x9 6x2(x8)6 9 一、解方程。#7 xx28 3x9x7 2 x7.5x9x8.5x5 62 7 3x x 9 x8.5x6 4.58 8 4 x91718x x4.5x3 1 x6x7 x79x6 4 1 9 x8x x5x7x20 4 2 x3x8x14 y3y4.5y1
5、1 5.5y7y5y105 x9x9 y98y6 4x(9x3)5x4(x1)1 1 7 bbb 83 3x2(x1)12(x4)8 4 4 4(x5)9x 3x2(6x1)63(x8)44(x2)42(76.5x)5(x4)2x 1 1 8(x2)2x8(x9)7y43y2 6 2 x3 3x 53 x3.5x19 2 3 x3 2x3 3x4 3(x5)7x 5 5 5a(67a)-3 6b(4b7)11 4x3(3x9)12 9y4(5y2)9 4(x2)5(x3)3x3(x6)3x4 7x3 x0.5x8 3 7 5x1 8x4 8x9(x7)6 9 9y1 5y6 2 5(104y)
6、(3y7)2 6 4y3 2y6 3y8 4 2(x4)8(x6)2 8 12 9x7 7x7 x3.5x15 2 7 3x1 6x9 6x5(x5)3 9 一、解方程。#5 xx57 9x2x9 4 8x3.5x4x0.5x35 89 2 7x x 1 9x4.5x8 17 8 8 x41420 x 3x8.5x15 5 x7x2 5x98x2 4 3 1 x4x 3x8x2x15 2 2 x3x8x9 2.5y5.5y3.5y19 7y3.5y9y144.5 8x9x4 y33y3 6x(6x6)3x2(x1)1 9 1 bbb 84 3x4(x4)53(x3)4 4 2 3(x7)7x
7、2x4(5x3)84(x1)34(x7)56(23.5x)5(x5)5x 1 1 2(x4)5x2(x7)y72y8 4 3 x3 2x 61 x5.5x14 3 2 x1 4x1 9x5 3(x6)9x 5 6 8a(57a)2 7b(5b3)2 4x2(4x4)18 9y2(6y4)2 4(x2)8(x5)5x5(x9)3x5 4x7 x1.5x2 3 8 7x8 3x2 9x6(x3)6 12 4y5 2y6 1 2(24.5y)(3.5y9)4 6 4y6 3y8 2y7 1 4(x1)8(x2)4 6 10 3x2 5x9 x3.5x3 3 6 7x2 3x8 4x2(x6)3 9
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