七年级数学上册一元一次方程25.docx

1、七年级数学上册一元一次方程25一、解方程。 1 8xx29 x7x8 8 4x14.5x6x9.5x30832 3x x 6 6x5.5x90.544 2 x62012x 3x2.5x20 7 x2x1 5x39x4 8 3 9 x4x 7x6.5x6x148 4 4x2x3x18 8y9y8.5y11 5.5y8.5y5y144.5 x7x5 y25y9 9x(7x6)4x5(x1) 9 3 9 bbb29 9x3(x4)44(x7)4 8 4 2(x8)7x 6x3(4x6)92(x3) 44(x5)32(58.5x) 5(x6)8x 1 1 8(x3)2x9(x1) 2y68y2 5 3

2、 x2 3x 23 4x0.5x19 4 5 x1 4x2 4x3 4(x7)6x 5 2 5a(47a)0 4b(4b8)21 8x3(6x2)2 4y2(6y2)4 2(x5)6(x2) 2x5(x2) 5x4 6x1 6x2.5x6 4 5 8x5 2x2 5x4(x2) 6 9 5y7 5y5 6 5(22.5y)(4y4) 2 8 7y8 7y1 6y8 6 4(x4)5(x3) 4 6 10 9x3 2x2 x9.5x5 3 8 9x6 9x4 7x3(x8) 6 12 一、解方程。 7 xx28 7x4x7 2 x12.5x9x15.5x20856 9x x 11 7x6.5x6

3、574 2 x3412x 2x6.5x9 1 x1x8 4x98x6 4 1 9 x8x 6x5x3x124 4 x5x2x17 6y8y8y13 y9.5y4y97 x9x8 4y24y7 7x(7x2)7x3(x1) 9 3 7 bbb49 7x4(x7)94(x1)4 4 8 5(x2)5x 5x3(5x6)35(x4) 43(x1)26(42.5x) 4(x4)5x 1 1 6(x2)4x8(x3) 6y85y9 4 4 x3 1x 25 9x8.5x12 5 6 x1 3x4 4x5 4(x6)8x 4 6 4a(34a)1 5b(4b2)0 8x2(6x7)15 6y2(3y4)8

4、 4(x3)5(x1) 6x5(x8) 2x6 6x2 5x7.5x6 3 5 6x1 4x1 5x9(x2) 6 12 7y4 8y3 6 3(101.5y)(2.5y5) 4 8 6y4 5y2 7y1 6 3(x5)6(x2) 4 8 10 7x7 4x6 x8.5x18 4 5 2x7 7x4 3x7(x4) 6 12 一、解方程。 5 xx59 8x3x4 4 5x7.5x9x1.5x101079 5x x 10 x3.5x8278 2 x3612x 3x2.5x20 1 x2x4 x39x1 2 9 5 x5x 4x7x3x154 8 x8x4x14 y5y9y13 4y1.5y4

5、.5y164 x4x6 y39y7 2x(9x1)6x4(x6) 3 9 1 bbb23 9x4(x4)44(x7)2 8 2 2(x8)7x 5x2(4x9)92(x8) 74(x10)26(37x) 3(x2)8x 1 1 5(x2)6x4(x5) y72y7 2 5 x4 2x 63 3x9.5x6 2 2 x1 3x4 7x1 5(x4)5x 6 6 2a(13a)-5 3b(6b3)3 4x2(3x9)7 9y4(4y9)10 4(x6)7(x5) 2x2(x3) 6x5 6x4 x5.5x10 2 5 7x6 7x7 9x5(x7) 3 12 9y3 2y8 5 5(53y)(3.

6、5y2) 4 6 7y8 6y8 5y7 6 2(x4)5(x3) 2 6 10 8x7 4x6 x0.5x9 3 8 4x2 6x3 2x8(x9) 3 9 一、解方程。 5 2xx28 9x5x6 2 x7.5x5x14.5x35819 3x x 15 x3.5x9232 8 3x32019x x9.5x4 5 x3x9 x69x5 8 9 7 x4x x1x8x182 8 14x5x8x3 5y5.5y2.5y7 8.5y5.5y8y36 x2x9 y69y7 9x(5x6)9x2(x8) 1 3 9 bbb81 6x4(x7)52(x2)8 4 2 4(x1)7x 5x4(5x8)85(x9) 72(x7)28(74x) 3(x3)9x 1 1 9(x4)2x9(x4) y69y9 3 3 x4 4x 24 4x0.5x4 3 6 x4 2x2 2x2 3(x1)8x 2 6 3a(67a)-4 5b(2b7)6 5x2(3x8)9 6y2(2y4)10 4(x1)5(x1) 7x2(x1) 9x9 2x3 x1.5x16 2 7 6x8 3x9 6x5(x6) 3 12 4y9 8y7 5 3(51.5y)(2y3) 2 6 4y8 4y8 3y8 5