初一数学上册解方程专项练习题21.docx

1、初一数学上册解方程专项练习题215 x 1 x 0.9x0.76.90.3x3 2 9 8 1 3x5x 4(x9)3(x6)105 2 1 2 (8x9)x8 5x8(6x)56 5 y1 y2 6 4.5x6.5(x7)15 3 6 1 2 (12x)(4x2) 9(3x8)156 7 7 x 1 x 0.4x0.13.98.3x6 4 3 8 1 7x4x 6(x7)3(x4)79 4 1 1 (5x1)x7 5x2(6x)46 5 y1 y2 4 4.5x7.5(x8)45 3 6 1 2 (54x)(2x5) 9(6x1)137 7 7 x 1 x 0.1x0.71.76.4x9 8

2、 9 8 1 8x3x 4(x1)9(x1)75 3 1 4 (7x4)x4 7x6(18x)93 5 y3 y2 9 3.5x2(x9)35 3 5 1 2 (23x)(4x3) 7(8x6)138 5 7 x 1 x 0.3x0.91.99.7x3 4 6 4 1 3x5x 3(x8)2(x8)203 2 1 1 (3x6)x9 8x9(19x)14 5 y1 y1 3 3.5x9(x3)20 3 5 1 2 (42x)(4x4) 9(6x2)137 9 5 x 1 x 0.2x0.36.59.6x3 2 3 8 1 7x4x 8(x7)3(x4)107 8 1 1 (7x7)x7 5x5

3、(12x)24 5 y3 y3 2 2.5x7(x3)30 3 6 1 2 (12x)(2x4) 3(2x4)208 7 5 x 1 x 0.2x0.82.70.2x6 6 9 4 1 4x3x 6(x5)2(x3)143 5 1 1 (2x5)x8 3x6(4x)77 5 y2 y3 3 3x10(x8)15 3 5 1 2 (42x)(3x1) 5(7x6)102 9 5 x 1 x 0.6x0.97.20.1x6 2 9 4 1 5x3x 6(x9)7(x8)129 4 1 1 (4x6)x4 9x3(16x)84 5 y1 y1 7 2x10(x4)15 2 5 1 2 (32x)(2

4、x1) 2(5x3)43 3 5 x 1 x 0.8x0.83.29.7x3 8 3 8 1 7x1x 3(x4)8(x8)75 4 1 4 (6x3)x9 2x9(4x)37 5 y2 y2 7 1x5.5(x8)45 2 5 1 2 (54x)(4x2) 6(5x7)53 7 7 x 1 x 0.1x0.10.55.9x6 2 9 2 1 4x9x 7(x6)9(x8)93 4 1 3 (3x5)x7 8x8(6x)93 5 y1 y2 5 2x8(x4)25 3 6 1 2 (34x)(2x3) 2(7x6)177 5 7 x 1 x 0.9x0.74.20.3x3 8 6 2 1 5x

5、1x 2(x3)4(x8)125 8 1 1 (2x7)x4 7x2(12x)43 5 y1 y3 2 0.5x7(x4)35 3 6 1 2 (53x)(5x3) 7(8x4)207 7 7 x 1 x 0.8x0.51.69.5x3 2 6 8 1 6x5x 3(x9)4(x2)127 7 1 3 (5x2)x6 6x8(2x)92 5 y2 y3 6 3x2(x1)20 2 6 1 2 (33x)(3x5) 9(8x4)37 7 5 x 1 x 0.5x0.97.82.9x9 4 6 8 1 5x3x 6(x4)3(x3)29 8 1 4 (6x1)x9 2x4(16x)64 5 y1

6、y3 9 3.5x9(x6)25 4 6 1 2 (42x)(5x4) 8(2x4)72 9 7 x 1 x 0.3x0.789.5x6 8 9 4 1 8x3x 5(x7)3(x8)195 8 1 1 (6x8)x6 4x6(20x)22 5 y2 y2 6 1x8.5(x4)30 3 6 1 2 (52x)(2x3) 3(3x5)82 9 7 x 1 x 0.7x0.93.58.8x9 8 6 4 1 6x5x 2(x2)5(x3)139 8 1 1 (4x7)x5 2x2(19x)47 5 y1 y1 2 0.5x1(x1)25 3 5 1 2 (24x)(5x1) 2(9x5)109 9 7 x 1 x 0.3x0.170.5x9 2 3 4 1 3x2x 5(x7)9(x4)85 5 1 2 (8x2)x4 7x2(11x)37 5 y3 y3 1 2.5x9.5(x2)25 4 5 1 2 (23x)(5x1) 4(7x2)204 5 5 x 1 x 0.2x0.99.18.4x9 8 6 4 1 5x9x 9(x4)7(x7)189 8 1 1 (6x4)x4 2x6(10x)14 5 y3 y1 5 4.5x2.5(x3)30 3 5 1 2 (42x)(5x5) 7(6x2)83 9