1. (2023一下·港南期中) 7+4=             16-8=             3元2角+3元=（ ）元（ ）角

11+8=           14-6=             2元5角+3元4角=（ ）元（ ）角

18-9=             15-5+2=        8元-4元6角=（ ）元（ ）角

15-7=             9+5=             7元-6元3角=（ ）角