ab=3 |×2 2ab=6
a+b=5
(a+b)²=5²
a²+2ab+b²=25
a²+6+b²=25
a²+b²=19.
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ab=3 |×2 2ab=6
a+b=5
(a+b)²=5²
a²+2ab+b²=25
a²+6+b²=25
a²+b²=19.