0.75乘七分之五加七分之二除三分之四
= 0.75 × 5/7 + 2/7 / (4/3)
= 0.75 × 5/7 + 0.75 × 2/7
= 0.75 × (5/7 + 2/7)
= 0.75 × 1
= 0.75
3乘(九分之二加十五分之二)减0.4
= 3 × (2/9 + 2/15) - 0.4
= 2/3 + 2/5 - 2/5
= 2/3
六分之一加4减(八分之一加六分之一)
= 1/6 + 4 - (1/8 + 1/6)
= 1/6 + 4 - 1/8 - 1/6
= 4 - 1/8
= 3 又 7/8
是否可以解决您的问题?