0.2×0.4=
×=
16÷=
20-0.2=
3×9÷3×9=
-=
+50%=
5×(+)=
46.7+2.3-20=
195﹣64=
6.8+2.95=
×=
7.5﹣﹣=
+÷40%=
×2.7=
÷=
1÷+÷1=
每本画册的价格/元
2.5
2.0
1.25
1.0
购买画册的本数/本
8
10
16
20
钢铁的质量/t
7.8
23.4
39
54.6
钢铁的体积/m3
1
3
5
7