Question

multiplicaion de numeros enteros:
a=45 b= -72 c=108 d= -40
1) a + b - c - d= 2) -b + c -a - d= 3) ( a - b)+(c-d)= 4) (-b+c)-(-d+a)= 5) (-a-d)x(-c+d)=
6) -a(b+c)= 7)-d(a+b)= 8) (-b+d)xa= 9) (-c-d) x (-b)= 10)(-a)+(-b) + (c) = 11) (2a) - (-3b) =
12) (3a-2b)-c= 13)(c-2a) x (2d) = 14) (c+b) x (d+a) = 15) (a-b-c)x(-d)=

Answer 1

a=45 b= -72 c=108 d= -40

1) a + b - c - d
45 + (-72) - 108 - (-40)
45-72-108+40
85-180
-95


2) -b + c -a - d
  (-72)+ 108 - 45 -(-40)
-72+108-45+40
-157+108
-49

3) ( a - b)+(c-d)
 [ 108 -(-72) ] + [-45 -(-40) ]
[ 108 +72 ] + [-45 +40 ]
[ 180 ] + [-5 ]
180 - 5
175

4) (-b+c)-(-d+a)
[ (-72)+(-45) ] - [ -(-40) +45 ]
[ -72-45 ] - [ 40 +45 ]
[ -117 ] - [ 95 ]
-117-95
-212