∵(a-b)2=9,(a+b)2=25,
∴a2+b2-2ab=9①,a2+b2+2ab=25②,
∴①+②可得:2(a2+b2)=9+25,
∴a2+b2=17.
已知:(a-b)2=9;(a+b)2=25,則a2+b2=_.
已知:(a-b)2=9;(a+b)2=25,則a2+b2=______.
數(shù)學(xué)人氣:565 ℃時(shí)間:2020-10-01 19:35:51
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