(14+4/5)*5/28 2/11*5/19+2/11*14/19 5/12-5/12*3/8 简便计算
问题描述:
(14+4/5)*5/28 2/11*5/19+2/11*14/19 5/12-5/12*3/8 简便计算
答
(14+4/5)*5/28
=14X5/28+4/5X5/28
=10+1/7
=10又1/7
2/11*5/19+2/11*14/19
=2/11x(5/19+14/19)
=2/11x1
=2/11
5/12-5/12*3/8
=5/12x(1-3/8)
=5/12x5/8
=25/96我算了一下好像不是10+1/7是2/5加1/7吧10怎么来的