口算.
|
(1)45 +32= |
(2)98 -64= |
|
(3)27 +18= |
(4)52 -24= |
|
(5)36 +57= |
(6)61 -19= |
|
(7)720 -80= |
(8)450 -400= |
|
(9)60 +580= |
(10)300 +2000= |
|
(11)2800 -2000= |
(12)800 +600= |
口算下面各题.
|
(1)630 +30= |
(2)710 -700= |
(3)260 +30= |
|
(4)630 +300= |
(5)710 -70= |
(6)260 +300= |
|
(7)530 +200= |
(8)530 -200= |
(9)260 +340= |