1. 3-

• : .

2. -1

. . 16+27=(10+6)+(20+7)=(10+20)+(6+7)=30+13=43

3. -2

. 15+1242+2960+39 8+7156+745+35 13+3265+954+78 12+2323+8767+43 16+2567+5481+33 . 25+36-30+10100-50+23-21

4. -3

, , . 10 . . 32-5=(20+12)-5=20+(12-5)=20+7=27 32-5=(22+10)-5=22+(10-5)=22+5=27 18+1684-1847-927-18

5. -4

. 494-397+849=949 497-397=100100+849=949 . 596+981-415-121= 628+372-144-482= 317-231+132-121= 876+131-234-123= 897+123-564-121=

6. -5

, , , , , . 379-9*2+34=395 9*2=18379-18=361361+34=395 . 598-20-6*8= 932+56:8-7= 96-72:9+15= 64:8+3*7-9= 32:4+3*2-9=

7. -6

, , , , , , , , , . 450-(30+16)+3*12=440 30+16=463*12=36 450-46=404404+36=440

8. -7

. (5+4)*10-12:3=837-16:8+107= 100-(40+36):4=256+4*9+382= 450-(30+16)+3*12=5*5-49:7= (100-40+36):4=250+399-9*8= 400-64:8*9=250+(399-9*8)= 200-(40+36:4)=(970-294)+72:9

9. -8

. 987-87-234+(23*2)=376-189+(400-11)*3= 1000-(400+360):4=515+186-(375-96):9= 1000-400+360:4=615-(656-439)*4+318= 231+98-99+(100:10)=210:7+168*2= (428-66*5):7=(766-670);4+(256-197)*3 (112-152:4)*3=(342-153):9+(800-724)*3

10. -9

. 4098+(785-608)*9=1000-135*5+408:4= 7509+(967-370)+(100:10)=4054-(152+63)*4= (6794+1000)+(999-888)*3=(556-381):5+2139= 400:4*30+2710+1766=143*3+290:2= 127*4+726+207+970=10000-999+217*5= 716:4-198:3+169=9997-8900+317*3=

11. -10

. 2546-(436:4)+1238=(4547-3268)-975= 5110-3426+(113*9)=5698-(1254+2050)= 6524-2365+(365*2)+2312=9000-(6512-3628)-2000= 2369-1300+(326:2)-569=(2164+2158-1269)+1254 8870-5088-1043=1200-93*9+648:6= 9654-2654+256=5000+(4600-1800):100=