(7/5+49)×1/49=7/5×1/49+49×1/49=1/35+1=1又1/35
7/12+(3/4-1/3)÷1/36=7/12+(3/4-1/3)×36=7/12+3/4×36-1/3×36=7/12+27-12=15又7/12