2x2+4x4+6x6+.20x20怎么簡便計算
2x2+4x4+6x6+.20x20怎么簡便計算
數(shù)學(xué)人氣:193 ℃時間:2019-10-30 22:46:29
優(yōu)質(zhì)解答
原式=(2*2+20*20)*(20*20/4)/2=20200
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