17.2+2.8=
0.6×0.9=
8÷0.8=
0.25a+0.5a=
123÷100=
0.74×100=
2.7÷3=
3-1.48=
0.25a+0.05×2=
0.25+0.5=
4.7-0.7=
1.2×5=
9÷0.3=
7.8÷6=
1.2×0.5=
7-1.99=
62.4-4=
105-76= 96÷12= 0.84+2.1= 0.2×0.5=
3.6÷18= 5×2.5= 40×1.4= 5.4+1.8=
每立方厘米的质量
单位: (克)
铝
2.70
铜
8.92
锡
7.28
锌
7.14
银
10.5
铅
11.3
铁
7.86