Question

calcule: a) (7-4)+(4-7)= b) -11 -2.(-3) +3= c) |2+3.(-2) | - |3 +2. (-3) | = d) |5-10|-|10 -5 - (-5) |=

Answer 1

 a) (7-4)+(4-7)=3-3=0
b) -11 -2.(-3) +3= -11+6+3=-11+9=-2
c) |2+3.(-2) | - |3 +2. (-3) | = |2-6|-|3-6|=-4-(-3)=-4+3=-1 
d) |5-10|-|10 -5 - (-5) |=-5-|10-5+5|=-5-10=-15