x-0.8x=42怎么解

x-0.8x=42怎么解 X*0.8=X-480怎么解?.. x-0.8x=1怎么解 0.8x+x=5.4怎么解 3.8x-x=42怎么解? 3.8x-x=42怎么解? (X+2)x(0.8-0.1)=0.8x怎么解 x-0.8x+0.7x=8.1方程怎么解 2.8x-0.8x=20-3x怎么解 x-15%x=42 500怎么解x x*x-x=90怎么解 x^2=(x+30)X(x-18)怎么解 x 5x=21.6-x-5x怎么解 (x+12)*(x+12)=x*x+360怎么解 x-(30-x)=(30-x)-x/3,怎么解 x*x=(x+10)*(x-6)怎么解 x(x+x)=48 求x 怎么解 (x+x+23+x+50)=3x 怎么解