Question

5分之4×7分之2÷7分之6×6分之5

用简便方法计算
0.62×60％＋5分之3×38％
6分之5÷[﹙3分之1＋4分之1﹚×7分之2]
5分之4×7分之2÷7分之6×6分之5
（6分之5+12分之5)×25分之24

Answer 1

0.62×60％＋5分之3×38％
=0.62×0.6+0.6×0.38
=(0.62+0.38)×0.6
=1×0.6
=0.6
6分之5÷[﹙3分之1＋4分之1﹚×7分之2]
=5/6 ÷ ( 7/12 ×2/7)
=5/6÷1/6
=5
5分之4×7分之2÷7分之6×6分之5
=4/5 ×2/7 ×7/6 ×5/6
=2/9
（6分之5+12分之5)×25分之24
=15/12 × 24/25
=6/5