1.6+0.4-1.6+0.4=1.6-1.6+0.4+0.4=0+0.8=0.8

=12-(1+0.6)*0.4=12-(0.4+0.24)=12-0.64=11.36

1.6/0.25/0.4=1.6/(0.25*0.4)=1.6/0.1=16

方法一:1.6/0.32*0.4=1.6/(0.32/0.4)=1.6/0.8=2方法二:(按顺序算)1.6/0.32*0.4=5*0.4=2

原式=128÷(1.6*0.4)=128÷0.64=12800÷64=200

=1.6x2.5-0.4x2.5=4x0.4x2.5-0.4x2.5=0.4x2.5x(4-1)=1x3=3

=3.17+0.64=3.81

25*(1.6*0.4)=25*0.4*1.6=10*1.6=16

3.6*0.4÷1.6=3.6*0.4÷4÷0.4=0.9x1=0.9

1.6÷0.4÷0.2=1.6÷(0.4*0.2)=1.6÷0.08=(1.6*100)÷(0.08*100)=160÷8=20