来自马光喜的问题
(-13)×2/3-0.34×2/7+1/3×(-13)-5/7×0.34
(-13)×2/3-0.34×2/7+1/3×(-13)-5/7×0.34
1回答
2020-03-24 06:11
(-13)×2/3-0.34×2/7+1/3×(-13)-5/7×0.34
(-13)×2/3-0.34×2/7+1/3×(-13)-5/7×0.34
(-13)×2/3-0.34×2/7+1/3×(-13)-5/7×0.34
=(-13)×(2/3+1/3)-0.34×(2/7+5/7)
=(-13)×1-0.34×1
=-13-0.34
=-13.34