X-0.4x=0.39

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X-0.4x=0.39X-0.4x=0.39X-0.4x=0.39X-0.4X=0.39（1-0.4）X=0.390.6X=0.39X=0.39÷0.6X=0.65

X-0.4x=0.39
X-0.4x=0.39

X-0.4x=0.39
X-0.4X=0.39
（1-0.4）X=0.39
0.6X=0.39
X=0.39÷0.6
X=0.65

X-0.4x=0.39 （X+X)+(X-X)+(X*X)+(X/X)=100 x-0.8x=0.4x=? X-0.4X=36 X+0.4X=21 X-0.4X=0.54 x-0.4x=0. 0.4X=X-50 x*x*x*x*x=80000? 0.2x+0.4x=12 x=?20x+x=420 x=? x*x*x=504 x*x*x=504 （x+x）+(x-x)+(x/x)=11.2 f(x)=x,x x+x=x+15 X(X-1)=X 180=( )x( )x( )x( ) ×( ) (x+30)*(x-18)=x*x x+ x+(x*50%)=1.5X?