1 535^2+1070×465+465^2 - 知识问答

1 535^2+1070×465+465^2

6个回答

535^2+1070×465+465^2
=535^2+2*535×465+465^2
=(535+465)^2=1000^2=1000000
2a^2-ab+2b^2
=2a²+4ab+2b²-5ab
=2(a+b)²-5ab
=2*5²-5*4=30
(a-b)²=a²-2ab+b²=(a+b)²-4ab=9
a-b=±3

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