解方程 5x+28=48 2×(7x-4x) =18 24 x -8 x =28.86 x-12=30 1.8÷0.3-0.2 x=2 5.6÷x=2×4 0.7x+4=25 4.5X+1.6X=42.7 5x+0.1x=50+6.1 3×9-x=8 1.2-0.9+5 x=0.87.2 x-3.6 x=9×0.4 4.5÷x -3=1.5 (7-1.4) x =2.8 20=5 x-3 x 1.8×2-0.3x=2.4 13.7—x=5.29 15 x-8 x+30=135 4.2×3—3x=5.1 8x+0.4×1.2=1.2 2 x+5=40 6.2 x-x=41.6 3.2÷x-2.4=0.8 9 x-14×5.5=58 5 x+1.5=4.5 100-9 x-12 x=37 8.5 x+6.5 x=225 x-0.8 x+0.7 x=8.1 0.5 x+1.5 x=15.6 4 x-18×2=20 |