Question

你能想出简便方法来计算下面各题吗？26×5+74×5+5 &...

你能想出简便方法来计算下面各题吗？26×5+74×5+5 6.74+12.62+24.38+3.26 0.89×4.8+5.2×0.89 0.4×99+0.4 34.5-（17.2+4.5） 87-2.123-0.877 （40+8）×125 32×3.8+32×6.2

Answer 1

①26×5+74×5+5
=（26+74）×5+5
=500+5
=505

②6.74+12.62+24.38+3.26
=（6.74+3.26）+（12.62+24.38）
=10+37
=47

③0.89×4.8+5.2×0.89
=0.89×（4.8+5.2）
=0.89×10
=8.9

④0.4×99+0.4
=0.4×（99+1）
=0.4×100
=40


⑤34.5-（17.2+4.5）
=34.5-4.5-17.2
=30-17.2
=12.8

⑥87-2.123-0.877
=87-（2.123-0.877）
=87-3
=84

⑦（40+8）×125
=40×125+8×125
=5000+1000
=6000

⑧32×3.8+32×6.2
=32×（3.8+6.2）
=32×10
=320