
- +5(5+7)=5+7
- +(3-8+7)=3-8+7
- +(-3+8+7)=-3+8+7
- +(-10-12+1)=-10-12+1

- -(5+7)=-5+7
- -(3-8+7)=-3+8-7
- -(-3+8+7)=+3-8-7
- -(-10-12+1)=+10+12-1

ա) + (56 + 42)= +56-42
բ) + (7 ⋅ 8 + 42)= +7⋅8-42
գ) − (45 − 35)=-(45+35) բ) − (45 − 7 ⋅ 5)=-(45+7⋅5)
դ) − (45 − 53)=-(45+53) դ) − (9 ⋅ 5 − 53)=-(9⋅5+53)
ե)+(48-93)-8=+48+93+8
զ)-(96-35)-6=-96+35+6
է)-(7⋅8-20)+7.8=-7⋅8+20-7⋅8
ը)+(99-5+8)-17=+99+5-8+17
թ)-(2⋅5+48)+23=-2⋅5-48-23
ժ)-(32-74)-74=-32+74+74
ի)+(-120-9⋅9)-81=+120+9⋅9+81
լ)+(120-9)+81=+120+9-81