计算:(1)(-2y²)³+y×y^5 (2)[(m+3n)²-(m-3n)²]÷(-3mn)因式分解:(1)a³b-3abc(2)a²-4b²
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计算:(1)(-2y²)³+y×y^5 (2)[(m+3n)²-(m-3n)²]÷(-3mn)因式分解:(1)a³b-3abc(2)a²-4b²
计算:(1)(-2y²)³+y×y^5 (2)[(m+3n)²-(m-3n)²]÷(-3mn)
因式分解:(1)a³b-3abc
(2)a²-4b²
计算:(1)(-2y²)³+y×y^5 (2)[(m+3n)²-(m-3n)²]÷(-3mn)因式分解:(1)a³b-3abc(2)a²-4b²
(1)(-2y²)³+y×y^5 =-8y^6+y^6=-7y^6
(2)[(m+3n)²-(m-3n)²]÷(-3mn)
=(m+3n-m+3n)(m+3n+m-3n)÷(-3mn)
=(6n)(2m)]÷(-3mn)
=-4
(1)a³b-3ab=ab(a²-3)=ab(a-√3)(a+√3)
(2)a²-4b²=(a+b)(a-b)
(1) (--2y^2)^3+y*y^5=--8y^6+y^6
=--7y^6.
(2) [(m+3n)^2--(m--3n)^2]除以(--3mn)=[(m+3n)+(m--3n)][(m+3n)--(m--3n)]/(--3mn)
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(1) (--2y^2)^3+y*y^5=--8y^6+y^6
=--7y^6.
(2) [(m+3n)^2--(m--3n)^2]除以(--3mn)=[(m+3n)+(m--3n)][(m+3n)--(m--3n)]/(--3mn)
=(2m)(6n)/(--3mn)
=(12mn)/(--3mn)
=--4.
(1) a^3b--3abc=ab(a^2--3c).
(2) a^2--4b^2=(a+2b)(a--2b)。
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