七年级数学上册一元一次方程专项练习题31.docx

1、七年级数学上册一元一次方程专项练习题315 x 1 x 0.8x0.76.36x6 2 3 2 1 7x2x 6(x4)5(x2)37 4 1 2 (6x5)x9 7x3(19x)33 5 y2 y2 9 0.5x1.5(x6)50 4 6 1 2 (43x)(5x4) 4(3x7)86 7 7 x 1 x 0.2x0.221x3 2 9 2 1 6x8x 5(x3)4(x1)127 7 1 4 (7x2)x7 9x9(7x)27 5 y2 y2 2 2.5x8.5(x2)20 4 5 1 2 (22x)(3x3) 8(5x4)156 3 7 x 1 x 0.5x0.25.41.6x9 4 9

2、 4 1 3x6x 6(x6)3(x2)209 4 1 1 (8x4)x8 6x4(13x)14 5 y1 y3 2 4x1(x1)25 3 5 1 2 (22x)(4x1) 5(4x4)36 9 5 x 1 x 0.7x0.66.19.8x6 2 6 8 1 7x2x 9(x1)2(x5)83 7 1 1 (7x7)x9 5x9(17x)55 5 y2 y3 3 2x2.5(x3)5 4 6 1 2 (14x)(5x3) 2(7x2)208 3 5 x 1 x 0.8x0.42.18.6x3 6 9 4 1 2x2x 2(x2)6(x3)187 6 1 3 (2x3)x6 7x4(3x)88

3、 5 y2 y2 8 4x7(x1)5 3 5 1 2 (24x)(5x2) 3(6x8)106 9 5 x 1 x 0.9x0.93.16.8x6 4 9 2 1 2x4x 2(x5)2(x4)89 2 1 2 (2x5)x3 9x4(1x)87 5 y3 y3 7 2.5x7(x3)15 2 5 1 2 (54x)(4x5) 3(7x5)188 5 5 x 1 x 0.6x0.72.17.6x9 8 9 8 1 9x3x 4(x4)8(x5)25 9 1 4 (5x2)x1 9x6(12x)57 5 y3 y2 5 3.5x2(x6)45 4 6 1 2 (22x)(3x5) 2(4x9)

4、199 3 5 x 1 x 0.6x0.28.62.3x9 6 3 4 1 3x2x 3(x2)6(x4)53 2 1 3 (6x3)x3 5x9(8x)57 5 y3 y3 6 1.5x6(x4)45 2 5 1 2 (52x)(4x2) 9(3x9)45 9 5 x 1 x 0.5x0.37.16.3x6 8 3 2 1 3x5x 9(x7)6(x7)165 8 1 3 (7x2)x8 8x5(12x)55 5 y2 y2 5 1.5x3.5(x4)40 3 5 1 2 (43x)(3x3) 5(9x5)115 7 5 x 1 x 0.3x0.766.2x3 2 6 4 1 7x6x 7(x8)2(x6)185 7 1 4 (8x7)x2 6x4(20x)77 5 y3 y2 4 0.5x2(x3)30 3 5 1 2 (34x)(5x3) 2(3x9)173 3