因为0.75=3/4,0.25=1/4,且除以一个数等于乘以这个数的倒数,链改所以原式等于棚颂判9×4/3+9×4,运樱磨用乘法分配律逆运算就是有36×(1/3+1)=36×4/3=48
=9÷3/4+9÷1/4
=9×4/3+9×4
=12+36
=48
9÷0.75+9÷0.25
=(9×4)÷(0.75×4)+(9×4)÷(0.25×4)
=36÷3+36÷1
=12+36
=48
9÷0.75+9÷0.25
=9÷0.25÷3+9÷0.25
=9÷1/此配4×1/3+9÷1/4×1
=9×4×(1/桐扒升局老3+1)
=36×4/3
=48
9÷0.75+9÷0.25=9÷(0.75+0.25)=9÷1=9