450-50/25*18
=450-2*18
=450-36
=414
101*9.36-9.36
=9.36*（101-1）
=9.36*100
=936
77.5*0.48+4.8*2.25
=7.75*4.8+4.8*2.25
=4.8*（7.75+2.25）
=4.8*10
=48