2x的平方y乘以-2xy的平方的3次方
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(x的平方+2xy+y的平方)(x的平方-xy+y的平方)的平方=(x²+2xy+y²)(x²-xy+y²)²=(x+y)²(x²
x/y=3所以x=3y(x²+2xy-3y²)/(x²-xy+y²)=(9y²+6y²-3y²)/(9y²-3y&sup
=1/2x²y³*9x²y²+4x²y²*x³y³+1/16y²*8x³y³=9/2x^4
x^3y-2x^2y^2+xy^3=x^3y+2x^2y^2+xy^3-4x^2y^2=xy(x^2+2xy+y^2)-4x^2y^2=xy(x+y)^2-4x^2y^2=12×7×7-4×12×12
(x分之x的平方-y的平方)乘以(x的平方-2xy+y的平方分之2x)其中x=2y=1=(x^2-y^2)/x*2x/(x-y)^2=(x+y)(x-y)/x*2x/(x-y)^2=2(x+y)/(x
∵y-2x=0∴y=2x∴原式=x^2+x(2x)+x^2(2x)^2-x^2/2x-(2x)^2=x^2+2x^2+5x^2-x/2-4x^2=4x^2-x/2
x减1分之x平方减1,化简为x+1得2005+1=2006第二问不太清楚
x的平方+x-6/x-3/x+3/x的平方-6-x=(x+3)(x-2)/(x-3)×(x-3)(x+2)/(x+3)=(x-2)(x+2)=x²-4x的平方+2xy+y的平方/xy-y的平
2xy/(y^2/x)=2xy÷(y^2/x)=2xy×(x/y^2)=2x^2/y再问:O(∩_∩)O谢谢
2xy²+3x³-x²yx降幂就是x的次数越来越低那么变为3x³-x²y+2xy²
=(xy-x的平方)除以(x的平方-2xy+y的平方\xy)乘以(x-y\x的平方)=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y
((x-y)(x-y))/((x-y)(x+y))=(x-y)/(x+y).
=(x+2y)(x-2y)/(x+2)²×(x+2)/3x(x+2y)=(x-2y)/3x(x+2)=(x-2y)/(3x²+6x)
x的平方-2xy/xy-2y的平方=x(x-2y)/y(x-2y)=x/y
原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)
x(y-x)÷(x²-2xy+y²)/xy×(x-y)/x²=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y
(-2y/x的平方)的平方乘以(-x/y)除以(2/xy)的四次方=4y²/x^4*(-x/y)÷(2/xy)^4=-4y/x³*(xy)^4÷16=-y的五次方/4x
a(x²+2xy+y²)-b(x²-y²)=a(x+y)²-b(x+y)(x-y)=(x+y)(ax+ay-bx+by)再问:你确定对吗?和我已开始算
(2X的平方Y-XY)乘以3XY=6X³Y²-3X²Y²
(x平方+2xy+y的平方)/(x+y)=(x+y)²/(x+y)=x+y