Question

用简便方法计算。 0.4×0.125×0.8 0.384+0.36+2.64

用简便方法计算。
0.4×0.125×0.8 0.384+0.36+2.64 0.64×102 6.04－1.83－1.17
3.7×1.8+2.3×1.8 1.29+3.7+0.71+6.3 2.5×28 0.5×2.7+6.3×0.5
4.6×0.4×0.25 6.7+4.95+3.3 2.5×（4+0.4） 1.08÷0.4÷0.25

Answer 1

0.4×0.125×0.8=0.4*0.1=0.04
0.384+0.36+2.64=0.384+3=3.384
0.64×102=0.64*(100+2)=0.64*100+2*0.64=64+1.28=65.28
6.04－1.83－1.17=6.04-3=3.04
3.7×1.8+2.3×1.8=1.8*(3.7+2.3)=1.8*6=10.8
1.29+3.7+0.71+6.3=1.29+0.71+(3.7+6.3)=2+10=12
2.5×28=2.5*4*7=70
0.5×2.7+6.3×0.5=0.5*(2.7+6.3)=0.5*9=4.5
4.6×0.4×0.25=0.46*0.1=0.046
6.7+4.95+3.3=6.7+3.3+4.95=10+4.95=14.95
2.5×（4+0.4)=2.5*4+2.5*0.4=10+1=11
1.08÷0.4÷0.25=1.08÷(0.4*0.25)=1.04÷0.1=10.4