1、2.5×1.9×4=4×2.5×1.9
3.8×2.7¬+6.2×2.7=(3.8+6.2)×2.7
2.97×0.5×0.2=2.97×(0.5×0.2)
32×10.1=32×(10+0.1)=32×10+32×0.1
5、4.2×5.5×1.2
=23.1×1.2
=27.72
4.6×1.45-1.08
=6.67-1.08
=5.59
2.95×0.2×3.4
=0.59×3.4
=3.9
6、0.25×4.78×4
=(0.25×4)×4.78
3.4×9+3.4
=3.4×(9+1)
=3.4×10
=34
2.7×4.3+2.7×5.7
=2.7×(4.3+5.7)
=2.7×10
=27
1.25×11×0.8
=(1.25×0.8)×11
=1×11
=11
4.6×102
=4.6×(100+2)
=4.6×100+4.6×2
=460+9.2
=469.2
7、5.5×1.5×5.5
=8.25×5.5
=45.375(平方米)
8、54×12.5×8
=54×100
=5400(千克)
9、0.07×12×5
=0.07×60
=4.2(千克)
10、50-4.5×10.6
=50-47.7
=2.3(元)
11、285×6×3.4
=1710×3.4
=5814(元)
全部售出后收入不能达到6000元
12、16.2×3.6=58.32(元)
16.2×12=194.4(元)
16.2×8.5=137.7(元