975-98=, 877, 777, 876, 767, 1000-19=, 951, 961, 991, 981, 852-55=, 797, 787, 777, 897, 838-88=, 770, 750, 650, 640, 707-91=, 718, 617, 616, 416, 901-8=, 895, 893, 897, 898, 644-5=, 619, 629, 639, 669, 815-5=, 610, 710, 810, 812, 540-8=, 543, 544, 545, 532, 717-8=, 759, 709, 768, 779

数学辅导：1000以内的减法

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