a-b=5,ab=3⼀2,求a눀+b눀和(a+b)눀的值

2024-12-27 20:04:29
推荐回答(2个)
回答1:

解: a²+b²
=(a-b)²+2ab
=5²+2×3/2
=25+3
=29

(a+b)²
=(a-b)²+4ab
=5²+4×3/2
=25+6
=31

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回答2:

a²+b²
=(a-b)²+2ab
=5²+2×3/2
=25+3
=29

(a+b)²
=(a-b)²+4ab
=5²+4×3/2
=25+6
=31