Question

(7a-8b)(a-2b)+(a-8b)(a-2b)

因式分解

Answer 1

=[6a+(a-8b)](a-2b)+(a-8b)(a-2b)
=6a(a-2b)+(a-8b)(a-2b)+(a-8b)(a-2b)
=6a(a-2b)+2(a-8b)(a-2b)
=[6a+2(a-8b)](a-2b)
=(6a+2a-16b)(a-2b)
=(8a-16b)(a-2b)
=8乘以(a-2b)的平方
=8（a平方-4ab+4b的平方）
=8a平方-32ab+32b的平方

Answer 2

(7a-8b)(a-2b)+(a-8b)(a-2b)
=(a-2b)【(7a-8b)+(a-8b)】
=(a-2b)(8a-16b)
=(a-2b)8(a-2b)
=8（a-2b）²

Answer 3

=（a-2b){(7a-8b)+(a-8b)}
=(a-2b)(8a-16b)
=8(a-2b)(a-2b)

Answer 4

=(a-2b)[(7a-8b)+(a-8b)]
=(a-2b)(8a-16b)