(+2又1/10)+(-1 又4/7)+(-2/5)+(-3/7)+(-4 又7/10)用简便方法计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 11:59:29
![(+2又1/10)+(-1 又4/7)+(-2/5)+(-3/7)+(-4 又7/10)用简便方法计算](/uploads/image/z/128333-29-3.jpg?t=%EF%BC%88%2B2%E5%8F%881%2F10%29%2B%28-1+%E5%8F%884%2F7%29%2B%28-2%2F5%29%2B%28-3%2F7%29%2B%28-4+%E5%8F%887%2F10%29%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97)
(+2又1/10)+(-1 又4/7)+(-2/5)+(-3/7)+(-4 又7/10)用简便方法计算
(+2又1/10)+(-1 又4/7)+(-2/5)+(-3/7)+(-4 又7/10)用简便方法计算
(+2又1/10)+(-1 又4/7)+(-2/5)+(-3/7)+(-4 又7/10)用简便方法计算
原式=(+2又1/10)+(-1 又4/7)+(-2/5)+(-3/7)+(-4 又7/10) =[2又1/10+(-4又7/10)+(-2/5)]+[(-1又4/7)+(-3/7)] =[-(2又3/5+2/5)]+(-2) =-(3+2) =-5