[x(1+30%)80%]-x=2700
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[x(1+30%)80%]-x=2700[x(1+30%)80%]-x=2700[x(1+30%)80%]-x=2700[x(1+30%)80%]-x=27001.04x-x=27000.04x=27
[x(1+30%)80%]-x=2700
[x(1+30%)80%]-x=2700
[x(1+30%)80%]-x=2700
[x(1+30%)80%]-x=2700
1.04x-x=2700
0.04x=2700
x=67500
[x(1+30%)80%]-x=2700
1.04x-x=2700
0.04x=2700
x=2700÷0.04
x=67500
1
[x(1+30%)80%]-x=2700
1.3*0.8x-x=2700
1.04x-x=2700
0.04x=2700
x=2700÷0.04
x=67500
[x(1+30%)80%]-x=2700
80%x+30-x=10%x
(1+30%)X×80%=200+X
x*(1+30%)*80%-x=112
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
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
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x/x平方-x+2=2x/x+1
(X+1)X(X+2)X(X+3)=504
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-16x=30x*x-7x-15 求x,可以只要答案.如图,全是正方形,一个边长为1,一个边长为4,求总面积,你也可以用你的方法.上面那个方程是我列的.5x*X+7X-72=0