已知a-b=10,b-c=5 ,求a*a+b*b+c*c-ab-bc-ca=?
已知a-b=10,b-c=5 ,求a*a+b*b+c*c-ab-bc-ca=?
數(shù)學人氣：236 ℃時間：2020-10-01 11:47:13
優(yōu)質(zhì)解答
a*a b*b c*c-ab-bc-ca=(a-b)^2 (a-b)(b-c) (a-b)^2=5^2 10*5 10^2=175
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