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这三道题
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891 + 482 + 118
= 891 + (482 +118)
= 891 + 600
= 1491
99 × 126
= 100 ×126 - 126
= 12600 -126
= 12474
473 +79 - 63
= 473 -63 +79
= 410 +79
= 489
= 891 + (482 +118)
= 891 + 600
= 1491
99 × 126
= 100 ×126 - 126
= 12600 -126
= 12474
473 +79 - 63
= 473 -63 +79
= 410 +79
= 489
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