七年级数学上册一元一次方程22.docx

1、七年级数学上册一元一次方程22一、解方程。 3 xx59 x2x2 8 x9.5x5x1.5x30279 9x x 19 x1.5x8178 8 8x81019x x8.5x15 9 x9x8 x86x5 8 1 5 x8x x2.5x7x168 8 20x2x2x17 y5y8y17 y1.5y1.5y31.5 x4x3 6y75y9 5x(3x2)4x5(x9) 7 1 7 bbb25 9x2(x8)85(x5)8 8 8 5(x5)2x 5x3(4x3)14(x8) 32(x5)58(87x) 3(x3)5x 1 1 4(x4)6x9(x8) y82y6 6 5 x1 1x 32 x4.

2、5x4 6 3 x3 3x1 5x1 4(x7)6x 5 2 7a(54a)-3 2b(4b8)4 3x2(2x9)17 5y2(1y6)4 2(x4)7(x1) 8x6(x2) 6x7 3x9 7x9.5x12 3 6 9x2 3x7 8x4(x8) 3 12 6y2 9y1 5 4(44.5y)(2y9) 2 6 4y6 4y1 9y3 6 4(x3)6(x1) 4 8 12 4x1 7x1 x2.5x16 2 7 8x7 8x9 6x2(x4) 3 12 一、解方程。 9 xx19 x7x9 8 5x4.5x9x11.5x30689 9x x 3 x6.5x63.542 8 6x7914

3、x x1.5x10 1 x2x1 3x96x3 8 5 5 x1x x5.5x6x122 8 x7x6x13 y6.5y10y4 10y7.5y9.5y167.5 x8x4 4y53y3 2x(3x3)3x3(x5) 3 5 7 bbb45 6x5(x2)35(x8)2 2 8 5(x1)8x 5x4(4x2)94(x5) 82(x3)58(92x) 5(x1)2x 1 1 2(x2)4x2(x5) y72y2 6 5 x3 3x 41 x0.5x20 6 4 x2 4x2 4x2 3(x3)2x 2 4 4a(65a)-5 9b(3b9)5 5x4(4x7)6 5y2(2y5)3 3(x1)

4、8(x3) 5x4(x4) 7x2 6x1 x1.5x6 3 7 4x3 3x4 6x9(x7) 6 12 8y1 4y9 6 6(83.5y)(4y2) 4 8 7y8 7y3 4y9 2 4(x6)6(x4) 4 6 12 8x5 7x5 4x9.5x8 2 5 6x7 4x4 3x2(x9) 3 12 一、解方程。 7 5xx47 3x5x9 8 3x2.5x3x2.5x10225 7x x 7 x3.5x2542 8 2x21518x 8x4.5x19 3 x1x6 x59x8 2 9 9 x9x 7x1x7x198 8 x3x3x15 6.5y7y5.5y12 3y6.5y4y106

5、 x7x3 3y82y2 4x(7x5)7x5(x5) 3 9 5 bbb23 7x2(x3)52(x4)4 8 8 5(x3)3x 6x3(4x4)64(x9) 93(x7)24(77.5x) 5(x7)6x 1 1 8(x3)2x3(x9) 9y49y5 3 4 x1 4x 66 x6.5x14 5 3 x1 4x4 6x6 2(x4)4x 5 4 9a(66a)-2 8b(6b3)9 7x2(5x8)18 6y2(2y2)3 4(x3)5(x3) 9x6(x9) 5x3 2x1 8x4.5x17 3 5 5x9 8x6 8x6(x8) 3 12 4y9 4y1 4 2(43.5y)(1.

6、5y3) 2 8 2y8 6y5 5y9 2 3(x4)7(x5) 2 8 10 7x6 2x2 3x1.5x3 2 6 2x2 7x7 7x2(x4) 6 12 一、解方程。 1 xx47 x2x4 2 6x8.5x4x8.5x15661 7x x 18 x3.5x2548 2 5x3317x x1.5x19 5 x2x5 x28x5 2 7 3 x1x 7x7.5x4x148 8 x8x6x11 y3y1.5y13 3.5y6.5y8.5y206 x9x3 y62y8 2x(8x7)4x3(x5) 5 9 7 bbb87 2x2(x2)84(x4)2 8 2 2(x6)6x 4x3(4x3

7、)64(x8) 84(x7)46(19.5x) 2(x7)7x 1 1 9(x5)3x3(x3) y49y9 5 6 x2 3x 42 x0.5x20 2 4 x2 3x2 5x4 4(x6)4x 3 5 4a(27a)-5 9b(4b6)5 8x2(6x3)16 4y2(4y5)6 4(x5)5(x6) 8x4(x2) 3x5 4x3 x1.5x16 3 8 9x4 3x5 4x5(x3) 3 9 9y9 9y1 5 5(82y)(1.5y1) 2 8 6y3 7y4 6y3 4 3(x6)7(x3) 2 6 12 6x3 3x4 6x0.5x6 3 6 6x2 5x1 7x3(x8) 3 12