1) -[5+7.(-3)]+21/7-4
-[5 - 21]+ 3 - 4
-[ - 16]+ 3 - 4
+ 16 + 3 - 4 = 15
2) 18 /(6.2-3)-(-4).2]
18/ (-36) - ( - 8) =
- 1/2 + 8 =
- 1/2 + 16/2 = 15/2
3) -[5/(-5)+2/(-2)]-10/(3.5-5)
-[(-1)+ (- 1)]-10/(15-5)
-[- 2]-10/(10)
2 - 1 = 1
Resolver sacando factor común:
a) 5x(-3)+5x(-2) = 5x ( -3 - 2 ) = 5x ( - 5)
b) 6x(-5)-(-4)x(-5) = (-5)x (6 + 4) = (- 5)x(10)
espero que te sirva,salu2!!!!!
