因式分解(3m+2n)²-4(m-n)²
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因式分解(3m+2n)²-4(m-n)²因式分解(3m+2n)²-4(m-n)²因式分解(3m+2n)²-4(m-n)²(3m+2n)
因式分解(3m+2n)²-4(m-n)²
因式分解(3m+2n)²-4(m-n)²
因式分解(3m+2n)²-4(m-n)²
(3m+2n)²-4(m-n)²
=(3m+2n)²-2²(m-n)²
=(3m+2n)²-(2m-2n)²
=(3m+2n+2m-2n)(3m+2n-2m+2n)
=5m(m+4n)
(3m+2n)²-4(m-n)²=(3m+2n)²-[2(m-n)]²
=(3m+2n)²-(2m-2n)²
=[(3m+2n)+(2m-2n)][(3m+2n)-(2m-2n)]
=5m(m+4n)
先全部乘开
的=9m²+12mn+4n²-4m²+8mn-4n².............................化简
=5m²+20mn.....................................因式分解
=5m(m+4n)