(1+2+3+4+···+99+100)乘(1+2+2+3+3+3+···+11)的积是奇数还是偶数?
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(1+2+3+4+···+99+100)乘(1+2+2+3+3+3+···+11)的积是奇数还是偶数?
(1+2+3+4+···+99+100)乘(1+2+2+3+3+3+···+11)的积是奇数还是偶数?
(1+2+3+4+···+99+100)乘(1+2+2+3+3+3+···+11)的积是奇数还是偶数?
(1+2+...+100)=50*(50+51)=5050所以乘积尾数为0,一定是偶数
偶数
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