X Y分之X-Y与(X Y)平方分之x平方-y平方
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通分为分母是(x+y)⒉(x-y),即为2xy(x-y)/(x+y)⒉(x-y)和x(x+y)/(x+y)⒉(x-y)
=x(x-y)/xy²×y/[-(x-y)]=-1/y
x-y=x/y两边同乘以y得xy-y^2=x移项xy-x=y^2即x(y-1)=y^2x=y^2/(y-1)
(xy-x的平方)除以xy分之x的平方-2xy+y的平方乘x的平方分之x-y=x(y-x)*xy/(x-y)²*(x-y)/x²=-y再问:不好意思,打错了(xy-y的平方)除以x
=(x-2y)(x-y)/(x-y)²=(x-2y)/(x-y)再问:做完啊。。。。。。再答:好了呀这个不可以再化简了,是一个最简分式了再问:刚刚不小心题目打掉了,你在看已知Y分之X等于7分
=(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再问:嗯
(x+y)y×xy的平方分之一=xy的平方/y的平方+xy的平方/xy=X的平方分之(x+y)
x平方+y平方+2xy分之x平方-4y平方除以x平方+xy分之2y+x=(x-2y)(x+2y)/(x+y)²·x(x+y)/(x+2y)=x(x-2y)/(x+y)
x平方-3xy+2y平方=0(x-2y)(x-y)=0x=2yx=y(1)x=2y则xy分之x平方+y平方的值=((2y)^2+y^2)/(2y*y)=(4y^2+y^2)/(2y^2)=5/2(1)
原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)
(x+3y)/(x²+xy)+(y-x)/(xy+y²)=(x+3y)[x(x+y)]-(x-y)/[y(x+y)]=[(x+3y)y-x(x-y)]/[xy(x+y)]=(xy+
3y与2y²的最简公分母是6y²3y分之x=x/(3y)=(2y×x)/(2y×3y)=(2xy)/(6y²)2y平方分之3x=3x/(2y²)=(3×3x)/
(2分之1x平方y—2xy+y平方)*3xy=1/2x²y*3xy-2xy*3xy+y²*3xy=3/2x³y²-6x²y²+3xy&sup
3x²y-{2xy-2(xy-3/2x²y)}+xy=3x²y-{2xy-2xy+3/2x²y}+xy=3x²y-2xy+2xy-3/2x²
2(x平方-6分之7y)平方分之(x-3分之2y)平方
=-x³y+12x^4y^4-12x^4y^4=-x³y
(x-y)²/(xy)-(x²-y²)/(xy)=(2y²-2xy)/(xy)=(2y-2x)/x
2y-xy分之x的平方-2x=x(x-2)/y(2-x)=-x/y;很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,
公分母是2(x+y)^2(x-y)/(2x+2y)=(x-y)*(x+y)/2(x+y)*(x+y)=(x^2-y^2)/2(x+y)^2xy/(x+y)^2=2xy/2(x+y)^2