6xy² 3xy
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因为x/y=2所以x=2y是[x^2-xy+3y^2]/[x^2+xy+6y^2]吧=(4y^2-2y^2+3y^2)/(4y^2+2y^2+6y^2)=5y^2/12y^2=5/12
3xy是3x原式=(x-3y)(x+2y)+3x+y+2十字相乘x-3y2×x+2y1所以原式=(x-3y+2)(x+2y+1)
原式=3xy+6y-xy+6x=2xy+6(x+y)=2*(-2)+6*4=24-4=20
=3(x+y)2
5xy+4x+7y+6x-3xy-4xy+3y=5xy-3xy-4xy+4x+6x+7y+3y=(5-3-4)xy+(4+6)x+(7+3)y=-2xy+10x+10y=-2xy+10(x+y)因为x
原式=x²y²-4+x²y²+4xy+4=2x²y²+4xy=2*36*4/9+4*6*(-2/3)=16
原式=2xy²+3xy²-6x²y+3xy²=8xy²-6x²y
=xy-3xy+2xy-xy=-xy
-3(2x²-xy)+4(x²+xy-6)=6x²+3xy+4x²+4xy-24=-2x²+7xy-24
3x-2xy-8-2x+6xy-x²+6=-x²+(-2+6)xy+(3-2)x+(-8+6)=-x²+4xy+x-2-x²+2xy-y²-3x
3(xy+2y)-(xy-6x)=3xy+6y-xy+6x=2xy+6(x+y)=2×(-2)+6×4=-4+24=20
先把代数式(5XY+4X+7Y)+(6X-3XY)-(4XY-3Y)化简(5XY+4X+7Y)+(6X-3XY)-(4XY-3Y)=5XY+4X+7Y+6X-3XY-4XY+3Y=-2XY+10X+1
-3(2x^2-xy)+4(x^2+xy-6)=-6x^2+3xy+4x^2+4xy-24=-2x^2+7xy-24再问:thankyou~
xy/x+y=6∴xy=6(x+y)3x-2xy+3y/-x+3xy-y=[3x-12(x+y)+3y]/[-x+18(x+y)-y]=-9(x+y)/17(x+y)=-9/17再问:你在啊?再答:在
3xy-3xy-xy+2yx=-xy+2xy=xy
是同类项同类项的定义为:所含字母相同,并且相同字母的指数也相同的项叫做同类项,所有的常数项都是同类项.3xy和-3xy的字母都是x和y,而且都为1次,所以是同类项.
结果为:xy(y+1)(y-1)过程:先提取公因式xy,则原式=xy(y^2-1),然后利用平方差公式可以得到原式=xy(y+1)(y-1)
原式=-x²y+2xy²+2x²y²-4xy³-3x³+27x³y-18x²y²+2x²y-18x&
因为,x-y=3xy所以:-3x+6xy+3y/[(7x-5y)-9xy-(3x-y)]=[-3(x-y)+6xy]/[(7x-5y)-9xy-(3x-y)]=[-3*3xy+6xy]/[7x-5y-