(-13)×1/3-0.34×5/7+2/3×(-13)-2/7×0.34 用简便方法计算
问题描述:
(-13)×1/3-0.34×5/7+2/3×(-13)-2/7×0.34 用简便方法计算
答
=(-13)×(1/3+2/3)-0.34×(5/7+2/7)
=-13×1-0.34×1
=-13.34