設(shè)x+2y=3z,判斷x^2-9z^2+4y^2+4xy是否為定制
設(shè)x+2y=3z,判斷x^2-9z^2+4y^2+4xy是否為定制
數(shù)學人氣:909 ℃時間:2020-06-29 14:44:03
優(yōu)質(zhì)解答
結(jié)果為0,答案為定數(shù)有沒有過程x^2+4xy+4y^2-9z^2=(x+2y)^2-9z^2=0
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