6.72×2/3+5/4×0.8
=2.24×2+5/4×4/5
=4.48+1
=5.48
1.875×(3/4+7/12)÷12.5
=1.875×4/3×2/25
=0.625×4×2/25
=2.5×2/25
=2/10