X-12.56=15.7

X-12.56=15.7 x×x×3.14=12.56 （X+X)+(X-X)+(X*X)+(X/X)=100 26.4x+18x=66.6 0.5×6+3x=4.8 2.5x-6=18.5 x-12.56=15.7 3.6+5.4x=273.6×5-0.5x=8.5 x-12.56= 15.7解方程 8X-3.2+2X=15.7 x*x*x*x*x=80000? 一元二次方程 （3.14×2x÷4）＋x＋（3.14x²÷x）＋（3.14x²÷x－x）=15.7 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? f(x)=x^2+x (x 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.