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tính nhanh : a.2 ×4 ×8 ×0,5 ×0,25 ×0,125 ×(0,4321 + 0,5679) b.3,7 × 3,8 + 8,3 × 3,7 - 0,4 ×3,7 ×5 c. 12,5 ×15,32 × 0,008 + 15,32 × 0,9 giải giúp mk nhé !
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