3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
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3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项
3x-2xy-8-2x+6xy-x²+6
=-x²+(-2+6)xy+(3-2)x+(-8+6)
=-x²+4xy+x-2
-x²+2xy-y²-3x²-2xy+2y²
=(-1-3)x²+(2-2)xy+(-1+2)y²
=-4x²+y²
=-x²+(-2+6)xy+(3-2)x+(-8+6)
=-x²+4xy+x-2
-x²+2xy-y²-3x²-2xy+2y²
=(-1-3)x²+(2-2)xy+(-1+2)y²
=-4x²+y²
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
-3(2x²-xy)+4(x²+xy-6)
合并同类项:(2xy²+3xy²)-(6x²y-3xy²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²