七年级数学上册一元一次方程专项练习题55.docx

1、七年级数学上册一元一次方程专项练习题557 x 1 x 0.1x0.85.19.2x9 2 9 2 1 8x4x 7(x4)2(x4)37 6 1 2 (9x2)x8 5x9(19x)54 5 y2 y2 7 2x3.5(x8)15 4 6 1 2 (43x)(2x1) 4(3x8)109 7 7 x 1 x 0.1x0.76.76.2x6 8 6 2 1 7x4x 4(x1)8(x9)59 3 1 3 (3x2)x8 5x8(8x)16 5 y3 y2 3 1x8.5(x1)20 4 5 1 2 (54x)(5x3) 4(7x1)15 3 5 x 1 x 0.3x0.884.8x6 2 6

2、4 1 2x2x 4(x7)3(x7)93 6 1 1 (9x7)x9 6x4(14x)37 5 y1 y1 3 0.5x7(x9)15 3 5 1 2 (43x)(5x4) 9(5x8)108 7 5 x 1 x 0.9x0.279x3 8 6 2 1 4x9x 5(x8)9(x8)65 9 1 1 (4x2)x6 7x6(10x)47 5 y2 y1 1 3x4.5(x2)10 2 6 1 2 (23x)(4x3) 3(3x8)26 7 5 x 1 x 0.3x0.34.51.7x9 4 6 8 1 7x7x 3(x8)4(x5)173 2 1 1 (3x9)x2 8x2(14x)68 5

3、 y2 y2 5 1x5(x4)45 4 5 1 2 (43x)(4x5) 5(7x7)169 5 5 x 1 x 0.1x0.47.30.3x9 2 3 4 1 6x1x 5(x8)7(x2)75 6 1 4 (4x9)x8 6x5(12x)55 5 y1 y3 2 1x1(x2)25 4 5 1 2 (52x)(2x4) 9(8x1)72 9 5 x 1 x 0.8x0.536.1x6 6 9 2 1 3x5x 5(x5)9(x5)97 3 1 3 (6x4)x2 7x6(6x)49 5 y2 y3 9 1.5x9(x1)15 2 5 1 2 (22x)(3x4) 6(5x1)57 3 5

4、 x 1 x 0.5x0.18.19.6x9 6 6 2 1 8x9x 8(x7)5(x4)103 5 1 3 (4x2)x3 5x2(3x)84 5 y3 y1 6 4x0.5(x3)40 2 6 1 2 (53x)(5x5) 8(6x6)189 7 7 x 1 x 0.9x0.74.14.5x9 2 6 4 1 4x8x 4(x8)3(x6)135 4 1 2 (3x3)x2 2x3(12x)16 5 y1 y2 7 2.5x6.5(x7)15 3 6 1 2 (44x)(5x1) 8(8x3)75 3 5 x 1 x 0.4x0.46.58.8x6 6 9 8 1 2x2x 2(x5)6(x9)19 8 1 3 (5x4)x3 7x3(7x)77 5 y3 y1 2 1.5x3(x2)5 2 5 1 2 (43x)(4x3) 2(7x9)25 5