
54×15÷3简便运算?
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fifty-seven × 15 + 30 = 57 × 15 + 15 × 2 = 15 × (57 + 2) = 15 × 60 - 15 × 1 = 900 - 15 = 88516 × 54 - 32 = 16 × 54 - 16 × 2 = 16 × (54 - 2) = 16 × 50 + 16 × 2 = 800 + 32 = 83213 × 64 + 12 × 39 = 13 × 64 + 12 × three × 13 = 13 × (64 + 36) = 13 × 100 = 1300
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fifty-seven × 15 + 30 = 57 × 15 + 15 × 2 = 15 × (57 + 2) = 15 × 60 - 15 × 1 = 900 - 15 = 88516 × 54 - 32 = 16 × 54 - 16 × 2 = 16 × (54 - 2) = 16 × 50 + 16 × 2 = 800 + 32 = 83213 × 64 + 12 × 39 = 13 × 64 + 12 × three × 13 = 13 × (64 + 36) = 13 × 100 = 1300
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57×15+30=57×15+15×2=15×(57+2)=15×60-15×1=900-15=88516×54-32=16×54-16×2=16×(54-2)=16×50+16×2=800+32=83213×64+12×39=13×64+3×13=13×(64+36)=13×13×100=1300
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57×15+30=57×15+15×2=15×(57+2)=15×60-15×1=900-15=88516×54-32=16×54-16×2=16×(54-2)=16×50+16×2=800+32=83213×64+12×39=13×64+3×13=13×(64+36)=13×100=1300
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fifty-seven × 15 + 30 = 57 × 15 + 15 × 2 = 15 × (57 + 2) = 15 × 60 - 15 × 1 = 900 - 15 = 88516 × 54 - 32 = 16 × 54 - 16 × 2 = 16 × (54 - 2) = 16 × 50 + 16 × 2 = 800 + 32 = 83213 × 64 + 12 × 39 = 13 × 64 + 12 × three × 13 = 13 × (64 + 36) = 13 × 100 = 1300
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