Pitomath
Anonymous
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- asked 2 months agoVotes
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Giải Toán 8 trang 43
a) (x+1)2−y2
b) x3+3x2+3x+1
c) 8x3−12x2+6x−1
a) (x+1)2−y2=(x+1+y)(x+1−y)
b) x3+3x2+3x+1=(x+1)3
c) 8x3−12x2+6x−1=(2x)3−3.(2x)2.1+3.2x.1−13=(2x−1)3