(a-3b)×(3a-b)-(a 5b)×(a-5b),其中a=一8,b=一6

(a-3b)×(3a-b)-(a 5b)×(a-5b),其中a=一8,b=一6
2025-03-22 19:52:40
推荐回答(1个)
回答1:

(a-3b)×(3a-b)-(a+5b)×(a-5b)
=3a²-ab-3ab+3b²-a²+25b²
=2a²-4ab+28b²
=2x(-8)²-4X(-8)(-6)+25x(-6)²
=128+32+900
=1060