7
12 ×
3
14 =
1
8 ,
4 -0.5=
4 , 5.2+1.91=7.11,
5
4 ×8+8×
4 =12,
0.3 2=0.09, 24÷
8 =64, 4.2+
5 =4.8, 0.9+99×0.9=90.