请各位数学大虾留步
问几个简便计算
8/19乘17+17/19乘11
1-1/10-1/100-1/1000-…-1/***********
参考答案:8/19*17+17/19*11
=17/19*8+17/19*11
=17/19(8+11)
=17
1-1-1/10-1/100-1/1000-…-1/***********
=1-(1+1/10+1/100+1/1000-…+1/***********)
=1-***********/***********
=***********/***********
只读高一水平有限