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35×22脱式计算的简便算法

脱式计算的简便算法 35×22 =35×2×11 =70×11 =770

=1000x4÷125 =1000÷125x4 =8x4 =32

脱式计算中不能有余数,如果有余数结果就不同了,答案必须是小数。例如400/(4*8)=400/32=12…16;400/(4*8)=400/4/8=100/8=12…4.结果两种方法不同。如果是小数其结果都是12.5。

等于4200÷(7×5) 等于4200÷7÷5 等于600÷5 等于120

4.2×(1.25乘以0.8) =4.2x(1.25x0.8) =4.2x1 =4.2

11×22+0.22×3300+330×4.4 =11×22+22×33+33×44 =11×22+22×33+33×2×22 =(11+33+66)×22 =110×22 =2420 或: 11×22+0.22×3300+330×4.4 =11×22+22×33+33×44 =(11+33)×22+33×44 =44×22+33×44 =44×(22+33) =44×55 =2420 .把小数变成正数,灵活运...

38×8+6×38-38×4 =38×(8+6-4) =38×10 =380

脱式计算就是一步一步的算,得出最终结果 。

50-(22-25) =50-(-3) =50+3 =53 35+27+1 =62+1 =63

1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 × 5/6 + 5/6 10. 3/4 × 8/9 - 1/3

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