初一数学上册解方程专项练习题28.docx

1、初一数学上册解方程专项练习题285 x 1 x 0.9x0.29.28.9x9 6 3 8 1 7x5x 3(x4)8(x5)177 3 1 1 (4x1)x8 5x4(7x)53 5 y1 y3 9 5x6(x8)5 3 5 1 2 (34x)(2x2) 4(4x5)52 3 5 x 1 x 0.6x0.72.39.8x3 6 3 2 1 2x2x 7(x3)2(x1)197 6 1 2 (9x1)x9 8x7(3x)13 5 y1 y1 9 1.5x9.5(x9)35 3 5 1 2 (44x)(5x2) 7(8x3)137 9 5 x 1 x 0.5x0.27.14.1x3 2 6 2

2、1 9x3x 4(x9)9(x5)185 9 1 2 (5x4)x1 4x5(15x)29 5 y3 y3 4 0.5x6.5(x5)15 4 6 1 2 (52x)(2x1) 3(3x2)157 7 7 x 1 x 0.7x0.99.14.6x6 2 6 2 1 2x4x 3(x5)5(x3)193 4 1 3 (3x6)x2 7x2(6x)75 5 y2 y1 9 1x4(x7)10 2 6 1 2 (44x)(5x2) 4(8x6)156 5 5 x 1 x 0.6x0.98.44x6 4 3 2 1 3x9x 4(x3)8(x7)165 9 1 1 (3x1)x2 4x7(15x)24

3、 5 y2 y3 5 4.5x5(x8)30 2 6 1 2 (23x)(4x5) 2(7x8)58 3 7 x 1 x 0.4x0.77.18x9 8 9 2 1 2x4x 8(x5)4(x2)79 5 1 1 (7x2)x7 2x8(17x)98 5 y1 y3 5 1x0.5(x9)25 4 6 1 2 (52x)(4x4) 7(7x9)119 7 7 x 1 x 0.1x0.22.82.8x9 4 9 2 1 7x6x 4(x4)2(x3)43 6 1 2 (6x2)x8 8x3(7x)95 5 y1 y3 2 2x7(x8)15 4 5 1 2 (43x)(3x4) 6(9x8)12

4、3 5 7 x 1 x 0.4x0.50.16.6x9 4 9 4 1 2x2x 2(x7)3(x3)87 2 1 1 (4x1)x4 6x8(13x)53 5 y1 y1 8 4x4.5(x7)35 4 5 1 2 (12x)(2x4) 7(6x1)89 5 5 x 1 x 0.5x0.24.49.3x3 4 6 2 1 3x4x 4(x6)4(x4)67 2 1 2 (7x9)x8 4x3(19x)27 5 y3 y2 5 2.5x4(x2)5 3 6 1 2 (14x)(3x3) 6(5x9)39 5 5 x 1 x 0.8x0.65.56.3x6 2 6 8 1 6x4x 4(x6)5

5、(x1)143 8 1 2 (2x8)x1 2x6(7x)65 5 y3 y1 7 2.5x4(x2)25 4 6 1 2 (42x)(5x3) 9(6x2)143 9 7 x 1 x 0.3x0.30.74.3x6 8 3 4 1 5x5x 8(x2)7(x4)145 7 1 4 (6x2)x6 3x3(20x)76 5 y1 y3 4 2.5x10(x2)20 3 6 1 2 (42x)(2x2) 8(2x2)172 9 5 x 1 x 0.5x0.46.47.8x9 8 3 8 1 3x9x 2(x4)3(x4)37 2 1 4 (8x4)x7 4x9(20x)66 5 y1 y2 6

6、2x8.5(x3)10 3 5 1 2 (23x)(3x4) 6(4x2)179 9 7 x 1 x 0.4x0.36.29.4x3 6 3 2 1 6x8x 2(x6)8(x6)97 9 1 2 (5x4)x8 9x5(19x)68 5 y2 y3 4 2.5x2(x8)45 2 5 1 2 (14x)(5x1) 4(7x8)118 7 7 x 1 x 0.8x0.51.28.1x6 8 9 8 1 3x6x 5(x1)9(x9)179 3 1 4 (9x3)x8 5x5(1x)16 5 y1 y1 8 5x6.5(x4)20 4 5 1 2 (43x)(5x5) 3(9x4)198 3 5 x 1 x 0.3x0.60.38.3x3 6 9 4 1 9x7x 2(x1)3(x3)83 2 1 2 (7x8)x6 6x5(18x)68 5 y3 y1 8 0.5x9.5(x1)30 2 6 1 2 (43x)(2x3) 6(4x9)116 3 7 x 1 x 0.9x0.25.94.8x6 6 3 4 1 7x9x 8(x2)5(x8)27 9 1 1 (5x2)x4 6x4(14x)78 5 y2 y2 4 3x4.5(x8)20 4 5 1 2 (53x)(5x2) 7(9x1)127 3