+ = + = - = 1- - =
53= 2- = + = + + =
数射线上找出下列正数。
、3.5、7
× = 24÷ = × = - =
÷3= 3 -2.7= ÷5= 14× =
- = 0.8×1.1= + = 7.2+12.8= + =
+ = - = 1-0.25= 1- = 42=
- = 0.8+0.9= + = 0.75-0.4= 0.72=
- = 0.125×8= + = 3.6-0.6= + =