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1、(1)989 - 423 = (2)279 - 182 = (3)433 + 726 = (4)691 - 155 = (5)602 + 196 = (6)720 + 332 = (7)445 + 251 = (8)959 + 495 = (9)980 - 412 = (10)422 + 360 = (11)292 - 255 = (12)539 - 531 = (13)952 + 234 = (14)335 + 441 = (15)792 + 146 = (16)231 - 108 = (17)952 - 726 = (18)165 + 241 = (19)471 + 185 = (20)3

2、95 + 291 = (21)357 - 182 = (22)759 + 450 = (23)851 + 468 = (24)939 - 155 = (25)488 - 257 = (26)879 + 667 = (27)482 - 285 = (28)393 - 208 = (29)952 + 249 = (30)966 - 252 = (31)690 + 762 = (32)794 + 532 = (33)360 - 224 = (34)877 - 482 = (35)703 - 560 = (36)788 + 459 = (37)335 - 277 = (38)898 + 184 = (

3、39)377 - 124 = (40)122 + 160 = (1)699 - 547 = (2)171 + 106 = (3)896 - 478 = (4)348 + 222 = (5)343 - 138 = (6)494 - 370 = (7)981 - 643 = (8)631 - 399 = (9)826 + 140 = (10)483 + 911 = (11)453 + 203 = (12)995 + 912 = (13)544 + 935 = (14)451 - 142 = (15)284 - 154 = (16)989 + 449 = (17)573 + 909 = (18)95

4、1 - 278 = (19)952 + 748 = (20)953 + 679 = (21)480 - 460 = (22)210 + 524 = (23)513 + 566 = (24)214 - 205 = (25)789 - 650 = (26)138 + 917 = (27)750 - 181 = (28)588 + 717 = (29)782 - 112 = (30)318 + 613 = (31)648 + 365 = (32)665 - 440 = (33)109 - 106 = (34)619 - 144 = (35)107 - 102 = (36)645 - 521 = (3

5、7)902 - 173 = (38)738 + 747 = (39)928 - 773 = (40)568 - 137 = (1)559 + 514 = (2)624 - 544 = (3)849 - 494 = (4)893 - 493 = (5)322 - 311 = (6)384 + 325 = (7)486 - 145 = (8)713 - 314 = (9)890 + 779 = (10)141 + 769 = (11)869 - 462 = (12)642 - 240 = (13)657 - 506 = (14)358 + 173 = (15)285 - 246 = (16)616

6、 - 443 = (17)842 - 188 = (18)516 - 288 = (19)616 - 554 = (20)777 - 503 = (21)520 - 101 = (22)609 + 206 = (23)213 + 219 = (24)187 - 124 = (25)279 - 201 = (26)546 - 447 = (27)726 + 369 = (28)862 - 422 = (29)463 + 713 = (30)944 - 469 = (31)701 + 548 = (32)948 + 996 = (33)452 - 296 = (34)587 + 333 = (35

7、)764 + 334 = (36)292 + 906 = (37)906 + 298 = (38)854 + 579 = (39)887 - 751 = (40)982 + 651 = (1)134 + 947 = (2)383 + 412 = (3)488 + 890 = (4)705 + 666 = (5)574 + 593 = (6)506 - 355 = (7)313 - 200 = (8)771 + 193 = (9)761 + 295 = (10)144 - 106 = (11)777 + 867 = (12)349 - 230 = (13)558 - 421 = (14)309

8、+ 308 = (15)670 - 409 = (16)209 - 125 = (17)235 + 737 = (18)243 + 589 = (19)573 + 544 = (20)234 + 608 = (21)156 - 101 = (22)337 - 189 = (23)409 - 191 = (24)844 - 271 = (25)639 - 536 = (26)720 + 215 = (27)179 + 214 = (28)893 - 520 = (29)682 - 568 = (30)412 + 721 = (31)513 + 679 = (32)961 + 546 = (33)

9、853 + 370 = (34)171 - 117 = (35)888 + 601 = (36)265 - 121 = (37)572 + 876 = (38)717 + 813 = (39)620 + 755 = (40)446 - 446 = (1)350 - 181 = (2)855 + 995 = (3)612 - 379 = (4)875 + 990 = (5)451 - 205 = (6)611 - 480 = (7)612 + 623 = (8)900 + 655 = (9)555 - 317 = (10)833 - 752 = (11)279 + 752 = (12)422 - 237 = (13)833 - 171 = (14)859 + 734 = (15)146 - 128 = (16)899 + 393 = (17)744 + 727 = (18)669 + 162 = (19)358 + 215 = (20)844 - 287 = (21)994 - 510 = (22)385 + 899 = (23)126 - 110 = (24)223 + 461 = (25)432 - 184 = (26)134 - 119 = (27)528 + 185 = (28)852 + 957 = (29)332 + 184 = (30)254 + 180 = (3

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