一位数的四则运算
(1)2791 - 1935 =
(2)3742 + 5403 =
(3)1928 - 1393 =
(4)6797 + 2124 =
(5)2435 + 7049 =
(6)8149 - 7885 =
(7)7168 - 1811 =
(8)4357 + 4641 =
(9)1160 + 2514 =
(10)3803 + 1001 =
(11)6131 + 2505 =
(12)4624 + 4691 =
(13)2805 + 5157 =
(14)1577 - 1547 =
(15)8089 - 5036 =
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