求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
(X+4)/0.2-(X-3)/0.5=0.2 x-(x-1)/6=3-(x+2)/3 x/12-(2x-1)/20={
1/2X^3-1/4X+0.2X^2+0.25x-0.5x^3-1/5x^2的值与x无关
(1)3x(x+0.2)=4x(x-1.1)
4分之x-y=﹣1 x+4y=4,求x,y 0.2x+0.5y=5分之1 0.4x+0.1y=5分之2,求x,y
先化简再求值先化简再求值:(x-x/x+1)(x+1/x^2+4x+4)(x^2-4/x^2-2x),其中x=-0.5
1.说明多项式1/2x³-1/4x+0.2x²+0.25x-0.5x³-1/5x²
4x-1.5 5x-0.8 1.2-x --- - --- = ---- 0.5 0.2 0.
(X-4)(x-2)-2(X-1)(X+3)其中X=-0.5
解不等式 0.2x>0.3x+1 0.5x-1
x-2/0.2-x+1/0.5=3 x=?
150.5x -4x +0.5x =7