运用平方差公式解(-2b-5)X(2b-5)
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运用平方差公式解(-2b-5)X(2b-5)
运用平方差公式解(-2b-5)X(2b-5)
运用平方差公式解(-2b-5)X(2b-5)
(-2b-5)X(2b-5)
=-(2b+5)*(2b-5)
=-(4b^2-25)
=25-4b^2
(-5)^2 - (2b)^2
(-5)平方-(2B)的平方
25-4b²
(-2b-5)*(2b-5)=(-5+2b)*(-5-2b)=(-5)²-(2b)²=25-4b²
(-5)平方-(2B)的平方
(-2b-5)*(2b-5)
=-(2b+5)*(2b-5)
=-(4b^2-25)
(a+b)X(a-b)=axa-bxb
5x5-2bx2b=25-4b方
-(2b+5)(2b-5)=-4b^2+25