七年级数学上册一元一次方程5.docx

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 5 一、解方程。7 xx59 x6x5 2 x15.5x4x11.5x10 46 3 3x x 3 x5.5x9 0.59 2 8 6x81519x 3x6.5x10 5 x1x4 4x38x8 2 5 5 x2x x1.5x6x16 4 4 x5x8x4 6y1.5y6y2 y4.5y1.5y154 x9x3 y83y7 4x(4x4)3x5(x1)3 1 9 bbb 88 9x3(x4)33(x5)8 4 2 3(x4)8x 6x4(3x3)34(x5)64(x4)44(39.5x)3(x5)7x 1 1 7(x6)5x8(x5)8y

2、34y9 3 5 x2 4x 45 4x3.5x15 6 3 x1 2x3 6x1 4(x8)3x 3 2 9a(36a)3 8b(5b3)24 9x3(2x8)17 4y2(1y6)6 4(x6)5(x4)9x5(x2)9x4 2x3 x7.5x5 2 5 9x4 9x8 7x6(x2)6 12 4y4 4y2 5 5(22y)(2.5y1)4 6 7y1 2y6 9y9 6 3(x4)6(x2)2 8 12 3x2 4x7 x8.5x6 3 7 3x4 6x9 6x5(x8)3 12 一、解方程。1 xx36 x7x3 2 x1.5x4x1.5x40 25 1 9x x 12 2x3.5x

3、4 0.58 4 4 x2719x x7.5x4 9 x4x2 x79x6 8 3 3 x3x x3x4x16 2 4 x4x8x15 6y7.5y3y7 2.5y1.5y8y21.5 x9x2 y87y7 8x(2x9)2x5(x1)3 5 1 bbb 27 6x4(x2)75(x7)2 2 4 5(x7)4x 6x4(6x3)62(x6)22(x1)98(22x)4(x6)7x 1 1 2(x1)2x3(x1)3y34y6 2 6 x1 2x 13 x7.5x15 5 6 x1 3x2 9x4 2(x4)7x 2 3 5a(68a)-4 7b(4b2)27 8x3(2x9)7 3y3(4y

4、7)4 4(x3)8(x2)4x4(x5)6x4 7x5 9x4.5x6 3 7 7x4 4x6 8x3(x9)3 12 6y8 3y9 6 3(42y)(1.5y4)2 6 4y9 4y6 6y1 6 2(x4)5(x1)4 8 10 7x7 2x4 x3.5x20 3 5 7x2 7x7 3x2(x4)3 12 一、解方程。9 xx47 4x8x7 8 x15.5x3x10.5x25 48 9 7x x 2 x2.5x2 35 8 4 x31814x 4x9.5x10 7 x7x2 x28x8 4 7 3 x8x 5x7x7x18 8 2 14x4x5x20 y1.5y5y20 2.5y6

5、y5.5y72 x7x2 y68y2 7x(9x9)8x3(x8)7 5 7 bbb 46 7x2(x6)43(x4)2 8 2 4(x2)2x 5x2(3x7)44(x6)54(x3)26(77.5x)4(x3)3x 1 1 8(x5)2x8(x6)y39y8 6 6 x3 4x 61 x8.5x7 3 2 x3 3x4 9x6 2(x6)2x 2 3 8a(36a)1 7b(2b4)1 3x4(3x8)13 5y2(5y2)8 2(x3)8(x4)9x2(x3)2x5 2x5 x9.5x11 2 8 3x1 8x4 6x9(x5)3 12 4y2 3y1 2 6(94y)(4y5)4 8

6、3y5 5y8 2y5 4 3(x2)5(x5)4 8 10 5x5 6x2 4x7.5x17 2 6 4x5 8x5 5x6(x5)6 12 一、解方程。5 xx27 x6x3 8 x18.5x7x14.5x45 107 1 3x x 11 x5.5x2 1.53 8 4 x6719x x0.5x16 1 x7x4 x38x6 8 5 9 x1x 2x1x7x20 8 8 x5x7x7 y9y3y11 4.5y4.5y8.5y65 7x5x7 8y85y7 3x(2x7)6x3(x1)5 7 1 bbb 47 8x3(x9)84(x8)8 4 4 5(x3)2x 4x4(4x4)85(x3)74(x2)76(99.5x)5(x6)5x 1 1 2(x1)4x8(x5)y78y6 2 6 x3 4x 46 x5.5x11 4 3 x2 3x4 4x5 3(x5)6x 2 3 7a(12a)0 5b(5b8)24 6x3(3x3)4 2y4(3y3)3 4(x1)7(x3)2x3(x9)9x1 2x1 2x2.5x20 2 7 7x2 3x3 5x6(x3)6 12 5y2 2y6 1 5(64.5y)(1.5y4)2 6 8y1 5y4 9y4 2 3(x2)7(x1)2 6 12 7x4 8x9 6x3.5x18 4 8 7x9 2x7 4x4(x6)6 12