Պարապմունք 49

  1. +5(5+7)=5+7
  2. +(3-8+7)=3-8+7
  3. +(-3+8+7)=-3+8+7
  4. +(-10-12+1)=-10-12+1
  1. -(5+7)=-5+7
  2. -(3-8+7)=-3+8-7
  3. -(-3+8+7)=+3-8-7
  4. -(-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

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