=7000÷140=50望采纳
原式=7000÷35÷4=200÷4=50
7000÷(35×4)
=7000÷140
=50
70*100/35/4=70/35*100/4=2*25=50
7000÷(35×4)=7000÷(35×2×2)=7000÷(70×2)=7000÷70÷2=100÷2=50