3.5×5／4＋1.25＋3／2÷4／5 =3.5×5/4+1.25+1.5×5/4=5/4×(3.5+1.5)+1.25=6.25+1.25=7.512.5×﹙36－36／5﹚÷3.6 =12.5×(1-1/5)×36÷3.6=12.5×4/5×10=12.5×8=10020／3÷﹙22／5－56／15﹚×0.9 =20/3÷[1/5...