初一数学上册解方程专项练习题12
—x +—=— 9 4 3 2 —- 4x = 2 -— 1 x 3 5 1 — (3x - 5) =— 1 x -9 6 5 y ——=-2 6 +—— y -1 4 5 0.1x -0.2=7.7+1.5x 4(x-8) +7(x-5) =16 6x +7(1-x) =-1 3x +0.5(x-8) =20
—(1+3x) =—(5x+2) 6 9 5 — x -—=— x 1 6 4 6 8 —- 3x = 5 +— 1 x 5 2 1 — (3x - 3) =— 2 x +2 9 5 6(7x+6) =9 0.1x +0.3=9.6+8.3x 2(x-8) +2(x+9) =7 8x -9(7-x) =-9
——=9+—— 3 6 1 — (5 + 4x) =— 2 (3x + 3) 7 5 7 — x -—=— x 1 9 2 6 4 —- 9x = 4 +— 1 x 7 7 1x -5(x+2) =50 4(5x-2) =16 0.5x -0.6=2.9+6.8x 4(x+5) +8(x+7) =12
—(4x-7) =—x +1 7 5 y ——=+2 2 +—— y +2 4 6 1 — (4 - 3x) =— 2 (2x - 5) 6 3 7 — x -—=— x 1 3 2 6 7x +5(11-x) =-3 1.5x +8.5(x+5) =20 2(2x-5) =16 0.9x +0.9=8.4+3.9x
—-9x =3+—x 7 7 1 — (6x - 2) =— 2 x +2 2 5 y ——=-2 1 -—— y +1 4 6 1 — (2 + 4x) =— 2 (3x - 5) 5 3 5(x+2) +5(x-7) =16 3x +6(17+x) =-6 4x +7.5(x+7) =50 2(6x-9) =14
—x +—=— 9 6 9 2 —+ 4x = 7 -— 1 x 3 9 1 — (7x + 4) =— 1 x +7 5 5 y ——=-3 7 +—— y -2 2 5 0.8x -0.2=2.9+8.9x 9(x+4) -9(x-6) =10 5x +4(10-x) =-6 5x +2.5(x+4) =25
—(4-2x) =—(4x-5) 5 3 5 — x -—=— x 1 6 2 9 2 —+ 4x = 4 +— 1 x 9 8 1 — (5x + 7) =— 1 x +4 4 5 6(2x-5) =2 0.3x -0.3=8.5+3.2x 9(x-3) +5(x-2) =6 4x +3(4+x) =-3
——=4-—— 2 5 1 — (5 + 2x) =— 2 (3x + 5) 7 3 7 — x +—=— x 1 3 2 3 8 —- 4x = 6 +— 1 x 5 9 2.5x -4(x-5) =40 3(2x-3) =16 0.5x +0.4=5.2+2.8x 8(x-6) +3(x-2) =20
—(8x+4) =—x +4 9 5 y ——=+1 5 -—— y +2 2 6 1 — (5 + 2x) =— 2 (5x - 4) 8 7 5 — x -—=— x 1 3 6 3 6x +8(19+x) =-7 1x -5.5(x+2) =40 7(9x+5) =7 0.5x +0.3=6.7+0.9x
—+3x =6-—x 7 5 1 — (3x + 5) =— 4 x +5 8 5 y ——=-2 3 -—— y +2 4 5 1 — (2 - 4x) =— 2 (3x - 3) 7 5 2(x+2) -8(x+4) =1 5x -5(3+x) =-3 4x +3.5(x-2) =30 8(4x-5) =20