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1) ▶-3.(4+7)=
- 3.(4) + -3.(7)=
-12-21= - 33
2)▶(6-10).(-2)=
6.(-2) + -10.(-2)=
- 12+20=8
3)▶(-12-20):(-4)=
- 12:(-4)+ -20:(-4)=
3+5=8
4)▶-7.(5-8)=
- 7.(5) + -7.(-8)=
- 35+56= 21
Saludos.