(1)900 + 200 =
(2)500 + 500 =
(3)400 + 700 =
(4)100 + 700 =
(5)800 + 600 =
(6)200 + 600 =
(7)800 + 700 =
(8)400 + 600 =
(9)600 + 700 =
(10)700 + 500 =
(11)600 + 100 =
(12)500 + 500 =
(13)500 + 100 =
(14)700 + 200 =
(15)100+700 =感謝您的采納。