Question

a). -(-54+21)+(-19+21)-(54+17)+2
b). -(-7+15-67)+(-67-7+15)+10
c). [-9+13-(-9+13-10)]-(-7+17)
d). (-11+37-42)+(-37+45+11)-5
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Answer 1

a) -(-54+21)+(-19+21)-(54+17)+2=

-(-33)+2-71+2=

33+2-71+2=

-34

b) -(-7+15-67)+(-67-7+15)+10=

-(-59)+(-69)+10=

59-69+10=

0

c) [-9+13-(-9+13-10)]-(-7+17)=

[-9+13-(-6)]-10=

(-9+13+6)-10=

10-10=

0

d) (-11+37-42)+(-37+45+11)-5=

(-20)+19-5=

-20+19-5=

-6

Sper sa-ti fie de ajutor!!