1) [847 - (1000-54x18):4]:10+16=
[847-(1000-972):4]:10+16=
(847-28:4):10+16=
(847-7):10+16=
840:10+16=
84+16=100
2) 5550-[100+100x(100-8x9)-2x19x10]x2=
5550-[100+100x(100-72)-2x19x10]x2=
(100+100x18-2x19x10)x2=
(100+1800-380)x2=
(1900-380)x2=
1520x2= 3040
3) [(945:5+175:7)x2]:(200-98x2)=
[(189+25)x2]:(200-196)=
(214x2):4=
428:4= 107