数的世界(2)
1: 3.2 0.09 70
3.1 4 3
2: 0.09 2.41 130.56
3: 7.95+0.46+9.54 5.4×0.33+5.4×0.67
= 7.95+(0.46+9.54 ) = 5.4×(0.33+0.67)
= 7.95+10 = 5.4×1
= 17.95 = 5.4
9÷0.75+9÷0.75 4.56×[1÷(4.1-4.09)]
=(9+9)÷0.75 = 4.56×(1÷0.01)
= 18÷0.75 = 4.56×100
= 24 = 456
4: 9.8-1.4-2.1=6.3(吨)
6.3÷3=2.1(吨)