簡便運算：12.5*（8-0.8）.2.7*4.3+5.7*2.7.0..77*99.6.18*9.9+0.618.0.25*1.25*0.8*40

簡便運算：12.5*（8-0.8）.2.7*4.3+5.7*2.7.0..77*99.6.18*9.9+0.618.0.25*1.25*0.8*40

12.5*（8-0.8）
=12.5*8-12.5*0.8
=100-10
=90
2.7*4.3+5.7*2.7
=2.7*（4.3+5.7）
=2.7*10
=27
0.77*99
=0.77*100-0.77
=77-0.77
=76.23
6.18*9.9+0.618
=0.618*99+0.618
=0.618*（99+1）
=0.618*100
=61.8
0.25*1.25*0.8*40
=（0.25*40）*（1.25*0.8）
=10*1
=10

1250*0.037+0.125*160+12.5*2.7怎麼簡算

=125*0.37+125*0.16+125*0.27=125*（0.37+0.16+0.27）=125*0.8=100
樓上小學沒畢業

1250乘0.037+0125乘160+12.5乘2.7，怎麼簡便計算

1250*0.037+0.125*160+12.5*2.7吧？相似的數位是125，考慮把1250、0.125、12.5都調整到一個數量級上1250*0.037+0.125*160+12.5*2.7=12.50*3.7+12.5*1.60+12.5*2.7=12.5*（3.7+1.6+2.7）=12.5*8=100…

1250*0.037+0.125*160+12.5*2.7怎樣簡便計算

1250*0.037+0.125*160+12.5*2.7
=1250*0.037+1250*0.016+1250*0.027
=1250*（0.037+0.016+0.027）
=1250*0.08
=100