0.3:0.7=0.51:x

x-0.7x=0.51 0.3:0.7=0.51:x x-0.7x=0.51快来帮我 x-0.7x=0.51怎么解 0.7x+0.3x=8.8 方程式 0.3x+0.7(200-x)=108 0.3x+0.4=0.7x-1 x-0.7x=0.51为什么x-0.7x= 3 (x-1)/0.3-(x+7)/0.5=1.7 x/0.7-(0.17-0.7x)/0. 0.3*X-X*0.25=0.15-0.7*X X多少急用 解方程 我都忘了= =65×0.3-7x=10.4 3.5+1.5x=11.5×0.5 x+0.7x=0.51怎么算... X-0.3X-（0.7X）x0.8=168 X-0.7X+110=X+X/4 这两个方程怎么解? 8x-5.5x=7.57.2x÷3.6=2 3x＋6x-8x=0.7 12x-2x-5x=4.512x-x=0 5x＋x=1.8 3.2x＋1.8x=64.8x-0.8x=6 6.3-0.3x=9.6 8.6x-8.5x=0.720x-2x=36 9x＋6x=4.5 18x-12x=5.42x-1.6x=3.6 18x＋3x=7×6 1.2x-0.5x=0.71.3x＋2.7x=1 4x-3.2x=6.4 0.8x＋3.2x＋3x=562.8x-2x=7.2 x-0.7x=64.8求x 0.5X+120+0.3X=X x-0.3x-0.5x=20 X+0.3X=1000 求X? (2x-1)/0.7=x/0.3-1/77x-3=6x-52-2/3x=x-3/23x-(x-1)=510+2(x-1/2)=7(x-2)1-(38x-2)/19=(2-3x)/33x-(3x-1)=x/6