3/4×4/15+2/5÷4/5=3/15+2/5×5/4=1/5+2/4=1/5+1/2=2/10+5/10=7/10
(3/4*4/15+2/5)/(4/5)=(1/5+2/5)/(4/5)=(3/5)*(5/4)=3/4
