(x+3y)²+(2x+6y)(3y-4x)+(4x-3y)²
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(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
还有几题:
a四次方-6a²-27
—56x³yz+14x²y²z-21xy²z²
5m(x-y)²+10n(y-x)³
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).
=(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).
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