∵a+b=1,a-b=-3,
∴a=-1,b=2,則ab=-2,
∴a2+3ab+b2=(a+b)2+ab=1-2=-1.
已知a+b=1,a-b=-3,求a2+3ab+b2的值.
已知a+b=1,a-b=-3,求a2+3ab+b2的值.
數(shù)學(xué)人氣:125 ℃時(shí)間:2020-05-14 06:10:00
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