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解方程(1)x2-27x+2=0(用公式法)(2)3x2+2x=5...

(1)x2-27x+2=0,b2-4ac=(-27)2-4×1×2=20,x=27±202,x1=7+5,x2=7-5.(2)3x2+2x=5,x2+23x=53

X-X/7=4.2 6X/7=4.2 6X=4.2x7 6X=29.4 X=29.4÷6 X=4.9

若32x^ay^2a+1z—3/2x^4y^3+xy^5—8是八次...xy^2-x^2y^2+y =(m+2)x^3+3nxy^2-x^2y...2-6) 14.x^4+7x^3+23x^2+27x-16=0怎么解...

一、.第一题好象有问题,27x^2应该是27x^3吧 27x^3+54x^2y+36xy^2+8y^3=(3x+2y)^3 二、原式=[1-(x-y)]^3=(1-x+y)^3 三、原式=(x+y)^2-(m+n)^2+(x+m)^2-(y+n)^2 =[(x+y)-(m+n)][x+y+m+n]+[x+m-(y+n)][x+m+y+n] =(x+y+m+n)[x+y-m-n+x+m-y-...

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