1.4x^2 y+3xy^2-x^2 y-3xy^2 -3 2.3(3a^2-2ab)-2(4b^2-ab) 3.2x-
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1.4x^2 y+3xy^2-x^2 y-3xy^2 -3 2.3(3a^2-2ab)-2(4b^2-ab) 3.2x-[(x+3y)-3(x-2y)]
1.4x^2 y+3xy^2-x^2 y-3xy^2 -3
2.3(3a^2-2ab)-2(4b^2-ab)
3.2x-[(x+3y)-3(x-2y)]
1.4x^2 y+3xy^2-x^2 y-3xy^2 -3
2.3(3a^2-2ab)-2(4b^2-ab)
3.2x-[(x+3y)-3(x-2y)]
1.原式=(4-1)x平方y+(3-3)xy平方-3=3x平方y-3=3(x平方y-1)
2.原式=9a平方-6ab-8b平方+4ab=9a平方-2ab-8b平方
3.原式=2x-x-3y+3x+6y=4x+3y
2.原式=9a平方-6ab-8b平方+4ab=9a平方-2ab-8b平方
3.原式=2x-x-3y+3x+6y=4x+3y
1.4x^2 y+3xy^2-x^2 y-3xy^2 -3 2.3(3a^2-2ab)-2(4b^2-ab) 3.2x-
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
合并下列同类项.xy^2-1/5xy^2-3x^2y+2x^2y+3xy^2-2xy^24a^2+3b^2+2ab-4a
(-3x^y+2xy)-( )=4x^+xy
约分 2x三次+x分之1-4x四次方 y-x平方y分之x平方y-2xy+y a平方-6ab+9b平方分之a平方-3ab
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2