(700+6)-(300+5)=(700-300)-(6-5)=...

Question

(700+6)-(300+5)=(700-300)-(6-5)= (500+60+7)-(300+40+5)=(500-300)+(600+(500+15)-(200+9)=(600-200)+(15-9)=

Answer 1

1) 401
2) 399
3) 222
4) 1706
5) 406