6.4÷0.5÷2
=6.4÷(0.5×2)
=6.4÷1
=6.4,
1.6÷0.04÷0.16
=1.6÷0.16÷0.04
=10÷0.04
=250,
1.8÷[0.6x(4-2.5)]
=1.8÷(0.6×1.5)
=1.8÷0.9
=2
6.4÷0.5÷2
=6.4÷(0.5*2)
=6.4÷1
=6.4,
1.6÷0.04÷0.16
=1.6÷0.16÷0.04
=10÷0.04
=250,
1.8÷[0.6x(4-2.5)]
=1.8÷0.6÷1.5
=3÷1.5
=20
6.4÷0.5÷2
=6.4÷(0.5×2)
=6.4÷1
=6.4
1.6÷0.04÷0.16
=1.6÷0.16÷0.04
=10÷0.04
=250
1.8÷[0.6x(4-2.5)]
=1.8÷[0.6x1.5]
=1.8÷0.9
=2
1)6.4÷0.5÷2=6.4÷(0.5×2)=6.4÷1=64
2)1.6÷0.04÷0.16=1.6÷0.16÷0.04=10÷0.04=10÷4×100=250
3)1.8÷[0.6x(4-2.5)]=1.8÷0.6÷(1.5)=3÷1.5=2
第1题和第3题的思路正相反,算是逆运算吧。