若a-b=13,a²-b²=39,a²+b²+2ab=____.
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若a-b=13,a²-b²=39,a²+b²+2ab=____.
若a-b=13,a²-b²=39,a²+b²+2ab=____.
若a-b=13,a²-b²=39,a²+b²+2ab=____.
若a-b=13,
a方-b方=39
(a+b)(a-b)=39
13(a+b)=39
a+b=39/13=3
所以,(a+b)^2=3^2=9
若a-b=13,
a²-b²=(a+b)a-b)=39,
∴a+b=3
a²+b²+2ab=(a+b)²=9____.
a-b=13
,a²-b²=39,-----(a+b)(a-b)=39
a²+b²+2ab=_(a+b)²
就能算了
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