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4×0.8×2.5×12.5簡便計算

4×0.8×2.5×12.5簡便計算

4×0.8×2.5×12.5
=4x2.5x（12.5x0.8）
=10x10
=100
有不明白的可以追問！謝謝！
祝學習進步！

12.5乘7.2怎麼簡便計算

12.5*7.2=125*0.72=（125*8）*0.09=1000*0.09=90

怎樣簡便就怎樣算2/3除5/8+1/3除5/8 7/12乘1/3+5/12除3

2/3除5/8+1/3除5/8
=2/3乘8/5+1/3乘8/5
=（2/3+1/3）乘8/5
=1乘8/5
=8/5
7/12乘1/3+5/12除3
= 7/12乘1/3+5/12乘1/3
=（7/12+5/12）乘1/3
=1乘1/3
=1/3