1) 235+(565+n)= (235+565)+n = 800+n
2) 412+k+158 = (412+158)+k= 570+k
3) 1353+2097+p = 3450+p
1) 235+(565+n)=800+n
2) 412+k+158=570+k
3) 1353+2097+p=3450+p
1) 235+(565+n)= (235+565)+n = 800+n
2) 412+k+158 = (412+158)+k= 570+k
3) 1353+2097+p = 3450+p
1) 235+(565+n)=800+n
2) 412+k+158=570+k
3) 1353+2097+p=3450+p