0.2x+0.2x*1.25+12=0.5x+2怎样计算0.2x+0.2x*1.25+12=0.5x+2

0.2x+0.4x=12 x=?20x+x=420 x=? 0.2x=0.8x-7.8(x=-13,x=13,x=12) 0.2x+0.2x*1.25+12=0.5x+2怎样计算0.2x+0.2x*1.25+12=0.5x+2 (0.2x+0.5)/0.04+(x-3)/0.6=12x (1+0.2)X=(X-64)/0. x-30-0.2x=0.5x x-0.2x=80 求x x-0.8x=12 x-0.7x=2.34 x-0.2x=16 列方程 x-0.8x=12 x-0.7x=2.34 x-0.2x=16 列方程 0.2(X-11)=12-0.3X 求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13 求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13 (X-8)/X=0.2(X-8)/X=0.2 X-X×0.2=1.18 x-0.2.x=180 x-0.2x=36 x=120+(x ×0.2) (x-1)+(x+2)+0.2x+2x=46 16^X - 12^X -9^X = 0.求X.