1/(x^2-13x+42)+1/(x^2-14x+48)+1/(x^2-15x+56)
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解方程((13x-x^2)/(x+1))(x+(13-x)/(x+1))=42
(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
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分解因式----(X*X-X)(X*X-X-2)+1
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计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15)
[(x+2)/(x+3)-(x+1)/(x+2)+(x+4)/(x+5)-(x+3)/(x+4)]/[(x的平方+7x+13)/(x的平方+8x+15)]
解分式方程:1/X-2+1/X-6=1/X-7+1/X-11/X-2+1/X-6=1/X-7+1/X-11/(x-2)-1/(x-1)=1/(x-7)-1/(x-6)(x-1-x+2)/(x-2)(x-1)=(x-6-x+7)/(x-7)(x-6)1/(x-2)(x-1)=1/(x-7)(x-6)(x-2)(x-1)=(x-7)(x-6)x^2-3x+2=x^2-13x+4213x-3x=42-210x=40x=4 为什么要移向才能解
】x(x+1)+x^2(x-1)
1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做
1、|x-|3x+6||>42、|2x-|x-2||
计算1、(x^2+13x+42)/(x+6)
因式分解(x-1)(x+2)(x+3)(x+6)-13
(x-1)(x+2)(x+3)(x+6)-13
解方程:x+1分之13x-x^2*(x+(x+1分之13-x))=42
计算:1/(x^2-13x+42)+1/(x^2-15x+56)+1/(x^2-17x+72)