1、七年级数学上册一元一次方程8一、解方程。 7 xx26 3x4x9 4 4x1.5x9x13.5x10231 9x x 15 x4.5x8352 4 x8820x 3x6.5x8 7 x7x6 3x48x1 8 9 1 x9x 9x9.5x5x192 4 19x6x7x16 y10y9y19 y7.5y6.5y172 9x3x6 7y48y6 6x(9x2)2x2(x8) 9 7 9 bbb44 3x4(x6)33(x6)8 4 2 2(x1)7x 6x2(6x3)73(x1) 22(x6)92(73.5x) 2(x3)5x 1 1 4(x1)5x8(x6) y63y4 4 2 x4 4x 5
2、4 8x1.5x14 2 6 x1 3x1 6x1 3(x3)8x 4 2 8a(44a)-5 8b(3b2)20 4x4(2x5)15 8y4(5y4)10 2(x1)5(x6) 9x4(x1) 7x3 4x9 x2.5x10 3 7 9x7 5x5 4x5(x4) 6 9 8y3 6y9 5 5(102y)(4y3) 4 8 5y9 9y6 7y9 1 3(x4)8(x3) 2 8 12 2x6 6x8 5x1.5x13 2 6 9x5 6x3 4x2(x3) 3 12 一、解方程。 9 6xx17 x3x4 4 x7.5x3x0.5x40256 5x x 14 x3.5x9424 2 x
3、91613x 9x5.5x9 1 x9x8 5x28x6 2 7 9 x1x 8x1x4x182 8 13x2x9x8 y7.5y6.5y8 y1.5y8.5y104 x2x6 y54y5 7x(2x2)5x3(x1) 7 9 5 bbb29 2x2(x3)12(x1)2 2 4 2(x2)3x 5x3(3x8)72(x6) 53(x9)32(32.5x) 5(x9)9x 1 1 7(x4)4x9(x5) y33y5 2 4 x4 1x 52 2x4.5x11 4 4 x1 3x2 2x1 5(x1)6x 5 6 4a(44a)-2 7b(2b3)12 3x4(2x7)6 2y3(2y6)3
4、2(x6)7(x4) 3x4(x2) 7x2 7x7 9x2.5x15 3 8 6x9 3x4 4x7(x9) 6 12 8y2 5y6 4 5(102.5y)(2y8) 2 8 9y1 6y6 4y1 1 2(x4)7(x4) 4 8 12 4x1 4x2 x8.5x4 3 6 9x1 7x8 3x2(x4) 6 12 一、解方程。 5 6xx48 9x7x3 8 x10.5x3x17.5x30255 5x x 17 3x8.5x5168 2 x4814x x2.5x19 1 x7x9 2x66x7 4 9 5 x8x 8x1.5x6x174 8 x6x9x19 4y5.5y7y14 3.5
5、y8y3.5y34 9x2x2 y97y5 9x(6x7)6x2(x3) 5 9 1 bbb23 9x5(x8)62(x6)8 2 8 5(x6)7x 6x2(6x4)43(x7) 53(x2)42(84x) 5(x2)6x 1 1 9(x2)4x7(x4) 5y68y3 5 4 x2 4x 22 5x2.5x18 6 5 x4 2x3 2x4 5(x4)8x 6 3 4a(27a)-5 8b(2b9)7 2x3(4x5)6 8y3(5y2)3 3(x1)8(x3) 9x4(x2) 4x9 9x6 8x2.5x20 3 6 5x9 8x6 5x4(x4) 6 12 2y8 4y3 2 2(51
6、.5y)(3y3) 4 6 7y5 8y4 9y7 6 2(x6)8(x4) 2 6 10 7x1 2x5 9x9.5x18 3 8 3x6 2x2 5x3(x5) 3 12 一、解方程。 3 5xx16 x9x7 8 8x7.5x3x10.5x30423 3x x 20 x2.5x2322 2 6x91918x x0.5x15 9 x8x8 4x78x1 2 5 5 x7x x8x7x192 8 7x8x3x12 6y3.5y10y5 y2.5y3.5y75.5 9x3x5 7y76y9 7x(5x6)9x2(x4) 1 9 7 bbb88 5x5(x2)52(x3)4 4 8 3(x2)3
7、x 4x4(6x3)42(x2) 74(x5)98(89x) 2(x8)6x 1 1 2(x2)4x1(x9) y32y7 4 3 x2 2x 44 4x3.5x5 5 6 x4 4x3 5x5 2(x7)9x 4 4 2a(45a)-1 8b(4b3)10 7x2(5x7)9 8y2(5y9)10 4(x1)6(x6) 5x3(x4) 3x4 7x3 x8.5x12 2 5 8x9 4x8 3x5(x9) 3 12 2y4 3y3 5 4(103.5y)(4y1) 2 8 6y8 9y9 3y4 5 4(x3)8(x6) 4 8 10 7x8 2x1 8x9.5x14 3 6 7x3 6x4 9x8(x2) 3 9
