簡便運算:(1/27-1/36)÷1/9 7÷5×(5/7+5/28)

簡便運算:(1/27-1/36)÷1/9 7÷5×(5/7+5/28)


(1/27-1/36)÷1/9
=(1/27-1/36)×9
=1/3-1/4
=1/12
7÷5×(5/7+5/28)
=7/5×(5/7+5/28)
=1+1/4
=5/4



4.36-3.27+5.64-4.73簡便計算


(4.36+5.64)+(3.24+4.73)=10+8=18