19+23=
5﹣1.6=
0.23÷0.1=
0.4×0.2=
=
÷0.25=
12.5×8=
3.14×102=
144÷12=
33÷11%=
0.1-0.01= 6.8÷10%= 3.6÷0.12= 398÷42≈
0.22= × = 24÷ = ×4÷ ×4=
12.7﹣3.6﹣5.4
+(-)÷
3.14×+3.14÷2.5
称量/g
弹簧长度/cm
0
10
12
20
14
30
16
40
18
50
①25×32×1.25
②(+0.375)÷(×)
③×+÷7
④6﹣(+)