4.61×3/7-5.39×(-3/7)-3×(-3/7)

问题描述:

4.61×3/7-5.39×(-3/7)-3×(-3/7)

4.61×3/7-5.39×(-3/7)-3×(-3/7)
=4.61×3/7+5.39×3/7+3×3/7
=(4.61+5.39+3)×3/7
=13×3/7
=39/7
=5又4/7