(a+b)²-4(ab-10²
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(a+b)²-4(ab-10²(a+b)²-4(ab-10²(a+b)²-4(ab-10²(a+b)²-4(ab-1)²
(a+b)²-4(ab-10²
(a+b)²-4(ab-10²
(a+b)²-4(ab-10²
(a+b)²-4(ab-1)²
=(a+b+2ab-2)(a+b-2ab+2)
(a+b)²-4(ab-10)²
=(a+b)²-(2ab-20)²
=[(a+b)+(2ab-20)][(a+b)-(2ab-20)]
=(a+b+2ab-20)(a+b-2ab+20)
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(a+b)²-4(ab-10)²
解,得:
==[(a+b)-2(ab-10)]*[(a+b)+2(ab-10)]
==(a+b-2ab+10)(a+b+2ab-20)
==
(a+b)²-4(ab-1)²
=(a+b-2(ab-1))(a+b+2(ab-1)
=(a+b-2ab+2)(a+b+2ab-2)