x*(1+30%)*80%-x=112
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x*(1+30%)*80%-x=112
80%x+30-x=10%x
(1+30%)X×80%=200+X
[x(1+30%)80%]-x=2700
x/6+x/12+x/20+x/30=1
X(X-1)=X
(x+30)*(x-18)=x*x
计算:(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9
x-2/5x-(x-2/5x)2/3-(2/5x-1/3x)=30求x
(x^2-3x+1) (x^2+3x+2)( x^2-9x+20)= -30求X
20+0.8x=x-14 112-4x=2x(80-4x)
x>=1,x
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
3x*x=1600+x*x-80x
x*x*x*x+2008x*x+2007x+2008(提示:x*x*x-1=(x-1)*(x*x+x+1))
x/x平方-x+2=2x/x+1
(X+1)X(X+2)X(X+3)=504