七年级数学上册解方程专项练习题28.docx

1、七年级数学上册解方程专项练习题285 x 1 x 0.6x0.87.44.1x6 2 6 2 1 5x7x 2(x4)9(x1)127 8 1 4 (3x2)x7 6x7(18x)54 5 y3 y2 2 5x3(x6)20 3 5 1 2 (43x)(5x4) 5(6x3)132 9 7 x 1 x 0.6x0.82.78.2x3 6 6 2 1 7x1x 6(x5)2(x8)139 6 1 2 (2x7)x1 4x5(3x)69 5 y1 y1 1 4x7.5(x8)45 3 5 1 2 (43x)(5x5) 4(5x8)198 3 5 x 1 x 0.6x0.18.69.5x6 8 6

2、8 1 7x1x 6(x3)2(x3)157 2 1 4 (3x4)x8 6x9(5x)64 5 y3 y2 2 3x5(x4)25 4 6 1 2 (24x)(2x4) 5(5x5)95 7 7 x 1 x 0.7x0.112.1x6 6 6 4 1 7x7x 3(x5)8(x7)45 9 1 2 (7x6)x9 5x9(19x)18 5 y3 y2 6 5x7(x2)40 3 5 1 2 (42x)(5x1) 2(6x3)77 9 7 x 1 x 0.4x0.53.97.9x6 2 6 4 1 2x8x 2(x1)5(x2)13 2 1 3 (4x6)x6 2x6(3x)27 5 y2 y

3、1 7 3.5x5.5(x4)45 3 5 1 2 (54x)(4x3) 8(3x8)44 9 5 x 1 x 0.8x0.327x3 4 6 4 1 3x3x 8(x7)2(x5)119 7 1 4 (7x4)x7 4x3(18x)28 5 y2 y2 3 4.5x9.5(x7)5 2 6 1 2 (22x)(4x1) 8(5x7)205 5 5 x 1 x 0.8x0.89.53.3x3 8 6 4 1 2x4x 3(x1)9(x3)105 9 1 2 (4x1)x8 7x8(3x)83 5 y3 y3 2 5x3.5(x6)45 3 6 1 2 (14x)(4x1) 6(6x8)134

4、5 5 x 1 x 0.6x0.39.88.6x3 2 9 2 1 6x3x 5(x1)7(x6)115 8 1 1 (9x5)x8 8x7(2x)57 5 y3 y3 9 4.5x1(x1)10 3 6 1 2 (34x)(3x1) 9(7x7)87 5 5 x 1 x 0.3x0.82.48.7x3 2 3 8 1 7x2x 4(x6)5(x4)103 7 1 4 (5x1)x2 6x2(9x)67 5 y2 y1 5 5x2.5(x2)15 2 5 1 2 (43x)(3x1) 5(3x5)72 9 5 x 1 x 0.9x0.597.1x6 4 9 8 1 7x9x 4(x9)6(x9

5、)93 7 1 1 (8x4)x8 2x3(19x)17 5 y2 y2 7 3x1(x9)35 4 5 1 2 (43x)(3x4) 3(4x8)144 3 5 x 1 x 0.9x0.90.36.5x6 8 3 4 1 3x9x 5(x1)8(x4)193 5 1 1 (8x6)x8 4x4(9x)79 5 y3 y3 6 1x0.5(x1)25 2 6 1 2 (52x)(5x3) 4(9x2)57 5 5 x 1 x 0.8x0.38.26.3x9 4 9 4 1 9x4x 5(x2)6(x1)129 5 1 3 (4x7)x5 7x2(14x)43 5 y3 y1 5 2.5x2.5

6、(x6)40 3 6 1 2 (54x)(5x5) 7(9x3)115 5 5 x 1 x 0.3x0.25.33.4x9 4 6 4 1 8x4x 2(x8)6(x9)127 4 1 3 (4x1)x4 9x2(18x)13 5 y2 y2 7 0.5x0.5(x1)35 4 5 1 2 (44x)(4x2) 4(8x9)35 9 7 x 1 x 0.1x0.49.94.4x3 8 6 8 1 9x8x 7(x4)6(x9)163 8 1 2 (3x2)x9 2x2(5x)46 5 y3 y1 1 1x3.5(x2)20 4 6 1 2 (42x)(2x1) 4(6x7)144 7 5 x 1 x 0.8x0.38.19.3x9 4 6 4 1 6x8x 6(x6)4(x7)115 5 1 4 (8x3)x3 9x2(1x)98 5 y1 y3 1 2.5x3.5(x7)50 4 6 1 2 (34x)(5x3) 9(3x3)103 5