如题所述
第1个回答 2014-05-18
7.42÷0.7-7.5×1.2
=1.06-9
=-7.94
5/7×7.5-5/7+5/7×3.5
=(7.5-1+3.5)×5/7
=10×5/7
=50/7
3÷[(4/5-1/2)÷1/2]
=3÷[3/10÷1/2]
=3÷3/5
=5
=1.06-9
=-7.94
5/7×7.5-5/7+5/7×3.5
=(7.5-1+3.5)×5/7
=10×5/7
=50/7
3÷[(4/5-1/2)÷1/2]
=3÷[3/10÷1/2]
=3÷3/5
=5
