初一数学上册解方程专项练习题47
—x +—=— 3 4 3 4 —- 4x = 6 -— 1 x 9 2 1 — (7x + 9) =— 2 x -2 3 5 y ——=-1 1 +—— y -3 3 6 0.8x +0.9=4.8-5.8x 3(x-1) -4(x+5) =16 2x -4(18+x) =-4 1.5x -4.5(x-2) =35
—(3-3x) =—(2x+5) 5 7 5 — x -—=— x 1 6 6 3 8 —+ 6x = 1 +— 1 x 5 5 1 — (4x + 9) =— 4 x +1 9 5 8(5x-8) =20 0.4x -0.1=3.5+0.1x 8(x-1) -7(x-7) =10 9x +7(17-x) =-7
——=5-—— 3 6 1 — (3 + 2x) =— 2 (5x - 4) 3 7 7 — x -—=— x 1 9 6 3 8 —+ 5x = 4 -— 1 x 5 9 4x -2.5(x-9) =35 9(5x+4) =15 0.7x -0.3=2.9-4.5x 3(x+5) +7(x+1) =15
—(2x+9) =—x -1 7 5 y ——=+1 7 -—— y -3 2 6 1 — (1 - 2x) =— 2 (2x - 4) 4 9 5 — x -—=— x 1 9 4 3 2x +4(10-x) =-1 4.5x -6.5(x-4) =25 7(3x-8) =4 0.3x +0.7=8.1+1.6x
—+3x =4-—x 5 2 1 — (3x - 3) =— 4 x +1 4 5 y ——=-1 2 -—— y +3 4 6 1 — (2 - 2x) =— 2 (5x + 4) 9 7 5(x+7) -2(x+1) =18 3x +3(10+x) =-5 4x -9(x+4) =50 9(3x+2) =8
—x +—=— 6 8 9 2 —+ 4x = 9 +— 1 x 7 4 1 — (5x + 7) =— 2 x -9 9 5 y ——=+2 3 -—— y +1 3 5 0.8x +0.2=6-1.2x 6(x+7) +6(x-8) =13 3x -4(1+x) =-1 2.5x +2.5(x+2) =20
—(2+2x) =—(4x-2) 9 3 5 — x -—=— x 1 6 6 3 2 —- 8x = 9 +— 1 x 7 8 1 — (8x - 9) =— 3 x +4 9 5 7(2x+9) =2 0.6x +0.5=8.5+4.9x 5(x+9) -4(x-1) =5 7x -6(4-x) =-4
——=5-—— 4 5 1 — (4 + 2x) =— 2 (3x + 5) 8 7 7 — x -—=— x 1 3 6 3 8 —- 9x = 8 +— 1 x 5 6 2.5x +3.5(x-7) =40 2(2x-7) =10 0.1x -0.6=6.7+4.9x 8(x+1) +8(x-5) =11
—(3x+9) =—x +3 5 5 y ——=+2 4 -—— y +1 4 6 1 — (1 + 4x) =— 2 (2x + 3) 5 5 5 — x -—=— x 1 6 2 9 6x -6(13+x) =-9 4.5x -2.5(x-8) =35 8(4x-4) =11 0.8x -0.2=0.8-7.9x
—-2x =8-—x 7 5 1 — (5x - 9) =— 1 x -8 8 5 y ——=-2 8 +—— y -2 3 5 1 — (3 + 3x) =— 2 (3x + 3) 6 7 3(x+5) +3(x-1) =7 7x -6(3+x) =-3 2.5x +10(x+7) =20 6(8x-6) =9