+=
1-=
-=
0.5-=
-= ÷3= += 4÷=
1.2×= 2.1÷= ×= ×=
- = 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= + =
- = 1- = + = + - + =
- = 0.2- =
4321+500= 13.2-5.2= × = 0.2×1.4=
8÷25%= + = 2.4÷ = ÷ =