國二數學，乘法公式1題?
回答 (4)
2019-09-22 7:00 am
a^2+2ab+b^2+(a+1)(b+1) = (a+b)^2 +(ab+a+b+1) = 7^2+ab+7+1 = ab+57
2019-10-05 7:55 pm
a+b=7
b=7-a
展開：
a^2+2ab+b^2+(a+1)(b+1)
=(a+b)^2 +(ab+a+b+1)
= 7^2+ab+7+1
= ab+57
-----接下來可不寫------
=a(7-a)+57
=-a²+7a+57
b=7-a
展開：
a^2+2ab+b^2+(a+1)(b+1)
=(a+b)^2 +(ab+a+b+1)
= 7^2+ab+7+1
= ab+57
-----接下來可不寫------
=a(7-a)+57
=-a²+7a+57
2019-09-23 8:33 pm
ab+57..........
2019-09-21 5:51 pm
應該要給ab.............
收錄日期: 2021-05-03 15:24:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20190921070528AAMXb78