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2. 27 + 3 – 45 : 5 + 16 =30-8+16= 22+16= 38
3. (2 · 4 + 12) (6 − 4) =(8+16)• 2= 24•2=48
4. 3 · 9 + (6 + 5 – 3) – 12 : 4 =27+ (11-3)- 3= 27+ 8-3= 35-3= 32
5. 2 + 5 · (2 · 3)3 =2+5•6•3= 2+ 30•3= 2+90= 92
6. 440 − [30 + 6 (19 − 12)] = 440- [30+6• 7]= 440- [30+42]= 440- 72= 368
7. {4 [7 + 4 (5 · 3 − 9)] − 3 (40 − 8)} = {4• [7+ 4• (15-9)]- 3•32}= {4• [7+ 4•6]- 96}= 4• [7+24]-96= 4• 31-96= 124-96= 28
8. (3 − 8)+ [5 − (−2)] = 3-8+5+2= 10-8=2
9. 5 − [6 − 2 − (1 − 8) − 3 + 6] + 5 = 5-[6-2-1+8 -3+6]+ 5= 14+5=19
10. 9 : [6 : (− 2)] =9 : [-3]= -3
11. [(− 2)5 − (−3)3]2 = [-10+9]•2= -1•2= -2
12. (5 + 3 · 2 : 6 − 4 ) · (4 : 2 − 3 + 6) : (7 − 8 : 2 − 2)2 =(5+6:6-4)• (2-3+6): (7-4-2)•2= (5+1-4)•(5): (1)•2= 2•5:1•2= 10•2= 20
13. [(17 − 15)3 + (7 − 12)2 ] : [(6 − 7) · (12 − 23)] =[2• 3+ (-5)•2]: [(-1)• (-11)]= [6-10]: 11= -4• 1/11= -4/11