(7a - 8b) × (7a - 8b) = (?)
已知:(7a - 8b) × (7a - 8b)
求:求 (7a - 8b) × (7a - 8b) 的值
解题:
(7a - 8b) × (7a - 8b)
= (7a - 8b)2
= (7a)2 - 2(7a)(8b) + (8b)2
= 49a2 - 112ab + 64b2
广告
已知:(7a - 8b) × (7a - 8b)
求:求 (7a - 8b) × (7a - 8b) 的值
解题:
(7a - 8b) × (7a - 8b)
= (7a - 8b)2
= (7a)2 - 2(7a)(8b) + (8b)2
= 49a2 - 112ab + 64b2