2X/(X/80+X/100)=
(X+X)+(X-X)+(X*X)+(X/X)=100
2x+3x+4x+5x+x+6x+7x=100
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)
(X/80+X/100 +5)*40=X,
f(x)=x²+3x|x-2|
3x=2(100-x)
f(x)=-x^2+2x(x>0) 0(x=0) x^2-2x(x
1X+2X+3X…+98X+99X+100X=50500X X等于多少?
1x+2x+3x+4x+5x+6x+7x…+99x=100
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
解方程(x-2)X(x的平方-6x-9)=x(x-5)X(x-3)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8