3*3 6*6 12*12 24*24 4*4 8*8 16*16 32*32=?有什么简便方法,公式是什么,我忘了?
人气：359 ℃ 时间：2020-05-08 10:18:09
解答
3*3+6*6+12*12+24*24+4*4+8*8+16*16+32*32==3*3(1+2^2+4^2+8^2)+4*4(1+2^2+4^2+8^2)==(3*3+4*4)(1+2^2+4^2+8^2)=25*85=2125
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