Question

用因式分解的平方差解下列各式!1.12x²-272.(x-2y)²-43.(x+1)²-（2x-3）²4.m²-9n²-

Answer 1

1.12x²-27

=（2√3x+3√3）(2√3x-3√3)

2.(x-2y)²-4

=(x-2y+2)(x-2y-2);

3.(x+1)²-（2x-3）²

=(x+1+2x-3)(x+1-2x+3)

=(3x-2)(4-x);

4.m²-9n²-m-3n

=(m+3n)(m-3n)-(m+3n)

=(m+3n)(m-3n-1);

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