4.2x+9.2=15.6-3.3x

4.2x+9.2=15.6-3.3x 4.7x+9.2=15.6-3.3x 4.7x十9.2=15.6-3.3x （X+X)+(X-X)+(X*X)+(X/X)=100 x-25%x=4.2 2x+30%x=9.2 (1-60%)x=0.32 x-25%x=4.2 2x+30%x=9.2 (1-60%)x=0.32 x-0.8x=4.2 x*x*x*x*x=80000? 4X减3.7x=12 4.2x加2.5x=1.34 8X减3x=15.6 (x减3）除2=7.5 35X加13x=9.6 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!)+.