Question

DAU MULTUMESC SI 20 DE PUNCTE VA ROG RAPID:
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1. Fie numerele intregi: a= -2, b= +3, c= -7.Calculati:
a) (a + b) -c + ( a + c); c)(a - b) + c - ( a + c);
b)(a - b) + (a - c) - ( b - c); d) [( a - c) - b] - a.
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2.Calculati:
a) -9 + | -4 | + 7 =....................................
b)| +7 | - (- 3) + | -1 | =................................
c) | -3 + 2 | + (-10) =.............................
d)-17 + | -3 - 5 + 2 | + (-11)=...........................
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Multumesc anticipat!
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Answer 1

Explicație pas cu pas:

Exercițiul 1:

a) (a+b)-c+(a+c)=(-2+3)-(-7)+[-2+(-7)]=1+7+(-9)=8-9=-1

b) (a-b)+(a-c)+(b-c)=(-2-3)+[-2-(-7)]+[3-(-7)]=-5+(-2+7)+(3+7)=-5+5+10=10

c) (a-b)+c-(a+c)=(-2-3)+(-7)-[-2+(-7)]=-5-7-(-2-7)=-12-(-9)=-12+9=-3

d) [(a-c)-b]-a={[-2-(-7)]-3}-(-2)=[(-2+7)-3]+2=(5-3)+2=2+2=4

Exercițiul 2:

a) -9+|-4|+7=-9+4+7=-5+7=2

b) |+7|-(-3)+|-1|=7+3+1=11

c) |-3+2|+(-10)=|-1|-10=1-10=-9

d) -17+|-3-5+2|+(-11)=-17+|-8+2|-11=-17+|-6|-11=-17+6-11=-11-11=-22