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1、(1)310 + 690 = (2)830 + 610 = (3)930 + 210 = (4)440 + 720 = (5)290 - 210 = (6)590 - 410 = (7)270 - 140 = (8)650 - 190 = (9)840 - 730 = (10)340 + 360 = (11)920 - 530 = (12)580 + 400 = (13)540 - 220 = (14)350 - 260 = (15)550 - 440 = (1)332 - 246 = (2)947 - 236 = (3)285 + 691 = (4)166 - 120 = (5)792 +
2、192 = (6)785 + 937 = (7)460 + 991 = (8)150 + 144 = (9)544 - 492 = (10)727 + 517 = (11)274 - 226 = (12)455 + 695 = (13)204 - 191 = (14)224 + 944 = (15)704 + 736 = (1)310 + 690 = (2)830 + 610 = (3)930 + 210 = (4)440 + 720 = (5)290 - 210 = (6)590 - 410 = (7)270 - 140 = (8)650 - 190 = (9)840 - 730 = (10)340 + 360 = (11)920 - 530 = (12)580 + 400 = (13)540 - 220 = (14)350 - 260 = (15)550 - 440 =