7.42÷0.7-7.5×1.2 5⼀7×7.5-5⼀7+5⼀7×3.5 3÷[(4⼀5-1⼀2)÷1⼀2]简便计算怎么算

2024-11-20 12:43:49
推荐回答(1个)
回答1:

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