Thực hiện phép tính

----- Nội dung ảnh -----
**Bài 3: Tính**
1) (11+12+13)−(1+2+3)
2) (33+32+31)−(1+2+3)
3) (56+57+58)−(8+7+6)
4) (23+25+27)−(13+15+17)
5) −(21+43+7)−(11−53−17)
6) (79+32−35)−(69+12−75)
7) (77+22−65)−(67+12−75)
8) −(−125+63+57)−(10−83−37)
9) (4+32+6)+(10−36−6)
10) (29+37+13)+(10−37−13)

**Bài 4: Tính**
1) 324+[112−(112+324)]
2) 513+[187−(287+113)]
3) 631+[587−(287+231)]
4) −257−[−(257+156)−56]
5) (−59+71)−[−83−(−95)]
6) [461+(−78)+40]+(−461)