2x+6y-x²+9y²=?

qszwii2022-10-04 11:39:544条回答

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Blue-feather 共回答了21个问题 | 采纳率95.2%
x2-9y2+2x-6y
=(x-3y)(x+3y)+2(x-3y)
=(x-3y)(x+3y+2
1年前
rickypeng 共回答了3个问题 | 采纳率
2x+6y-x^2+9y^2
=2(x+3y)+(3y+x)(3y-x)
=(3y+x)(3y-x+2)
1年前
xwy849 共回答了5510个问题 | 采纳率
=(2x+6y)-(x²-9y²)
=2(x+3y) -(x-3y)(x+3y)
=(x+3y)(2-x+3y)
1年前
送466个拥抱 共回答了12个问题 | 采纳率
=2x + 6y - (xx - 9yy)
=2(x + 3y) - (x - 3y)(x+3y)
=(x + 3y)(2 - x + 3y)
1年前

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(x+3y)²+(2x+6y)(3y-4x)+(4x-3y)²
(x+3y)²+(2x+6y)(3y-4x)+(4x-3y)²
还有几题:
a四次方-6a²-27
—56x³yz+14x²y²z-21xy²z²
5m(x-y)²+10n(y-x)³
这些避风港1年前1
windmoon2006 共回答了16个问题 | 采纳率87.5%
1.(x+3y)²+(2x+6y)(3y-4x)+(4x-3y)²
=(x+3y)²-2(x+3y)(4x-3y)+(4x-3y)²
=(x+3y-4x+3y)²
=(3x-6y)²
=9(x-2y)².
2.a四次方-6a²-27
=(a²+3)(a²-9)
=(a²+3)(a+3)(a-3).
3.—56x³yz+14x²y²z-21xy²z²
=-7xyz(8x²-2xy+3yz).
4.5m(x-y)²+10n(y-x)³
=5(x-y)²(m+2n(y-x))
=5(x-y)²(m+2ny-2nx).
xy-2x+6y-12 xy+8
pat661年前2
jinglixin112 共回答了21个问题 | 采纳率85.7%
xy-2x+6y-12 xy+8
=xy-12 xy-2x+6y+8
=-11xy-2x+6y+8
或者
xy-2x+6y-12
=(xy-2x)+(6y-12)
=x(y-2)+6(y-2)
=(x+6)(y-2)
那么 xy+8是干什么的?