admin百科知識 2022-02-13 18:54:59 (a+b+c)的平方-(a-b+c)的平方咋算忘了(a b c)的平方-(a-b c)的平方咋算忘了網友廻答:匿名網友此題用平方差公式計算 原式=(a b c)-(a-b c) = (a b c a-b c)(a b c-a b-c) = (2a 2c)x2b =4ab 4bc網友廻答:匿名網友(a b c)-(a-b c) =[(a c) b)]-[(a c)-b] =2b(a c) 2b(a c) =4b(a c) db標簽 生活常識_百科知識_各類知識大全»(a+b+c)的平方-(a-b+c)的平方咋算忘了
0條評論