1、3. 14×3=9.42 12÷3=4

2、90/360= 1/4 1/4×2×3. 14×8= 12.56

3、 180/360=0.5 0.5×2×3. 14×6= 18.84

4、62.8/20 = 3. 14 3. 14÷2÷3. 14 = 0.5m = 50cm

5、0.7×3. 14×90= 197.82 989. 1 ÷ 197.82=5

6、 12.5÷3. 14=4 12.56÷2+4= 10.28

7、0.5×2×3. 14×3 = 9.42 & lt； 9.92 so no, it should have been around for more than three weeks.

The topic is not difficult, but I am tired of typing these symbols.