x+2.05x=12.2

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x+2.05x=12.2x+2.05x=12.2x+2.05x=12.2x+2.05x=12.2(1+2.05)x=12.23.05x=12.23.05x÷3.05=12.2÷3.05x=4

x+2.05x=12.2
x+2.05x=12.2

x+2.05x=12.2
x+2.05x=12.2
(1+2.05)x=12.2
3.05x=12.2
3.05x÷3.05=12.2÷3.05
x=4

x+2.05x=12.2 （X+X)+(X-X)+(X*X)+(X/X)=100 x*x*x*x*x=80000? 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!)+. x=?x=? x-40%x= X+0.8X=? x-0.36x= A=｛X|X