[评论]趣味数学题目

chrisyue

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1.99999*22222+33333*33334=33333*(3*22222+33334)=33333*(66666+33334)=33333*100000=3333300000
2.19991999*19991998-19992000*19991997=19991999*(19991999-1)-(19991999+1)*(19991999-2)=19991999*19991999-19991999-19991999*19991999+19991999+2=2
the result is 2.
3.231001*371002*481003
because 1*2*3=6
so the last digit is 6.
4.if A is right, then B is wrong. means today is Thursday.but D is right. so A is definitely wrong.
if B is right. today is Monday. A is wrong. C is wrong. D is right.
so B is wrong.
if C is right. so today is not Thursday and Monday. and today is Saturday.
the answer is that today is Saturday.