4.61×3/7-5.39×(-3/7)-3×(-3/7)
1个回答
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
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