Mathematics
Junior High
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數學好難(;´༎ຶД༎ຶ`)
b
126.
-(a-b)
atb
單元10乘法公式與多項式
119
6 利用乘法公式代換求值
已知a+b=7,ab=8,且a>b,則:
(1) a²+b²=
(2)(a-b)²=
【解
a+b=
a2b7
62-76=8
27-8
第三冊
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