Question

Se se efectueze:
a) (+2)+(+7); (-3)+(-4); (+7)+(-3); (-2)+(+9); (-3)+(+3); (+5)+(-5); 0+(+2); (+3)+0; 0+(-2); (-4)+0.
b) (+2)-(+7); (-3)-(-4); (+7)-(-3); (-2)-(+9); (-3)-(+3); (+5)-(-5); 0-(+2); (+3)-0; 0-(-2); (-4)-0.

Answer 1

Răspuns:

Explicație pas cu pas:

a)  

( + 2 ) + ( + 7 ) = 2 + 7 = 9

( - 3 ) + ( - 4 ) = - 3 - 4 = - 7

( + 7) + ( - 3 ) = 7 - 3 = 4

( - 2 ) + ( + 9 ) = - 2 + 9 = 7

( - 3 ) + ( + 3 ) = - 3 + 3 = 0

( + 5 ) + ( - 5 ) = 5 - 5 = 0

0 + ( + 2 ) = 0 + 2 = 2

( + 3 ) + 0 = 3 + 0 = 3

0 + ( - 2 ) = 0 - 2 = - 2

( - 4 ) + 0 = - 4

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b)

( + 2 ) - ( + 7 ) = 2 - 7 = - 5

( - 3 ) - ( - 4 ) = - 3 + 4 = 1

( + 7 ) - ( - 3 ) = 7 + 3 = 10

( - 2 ) - ( + 9 ) = - 2 - 9 = - 11

( - 3 ) - ( + 3 ) = - 3 - 3 = - 6

( + 5 ) - ( - 5 ) = + 5 + 5 = 10

0 - ( + 2 ) = 0 - 2 = - 2

( + 3 ) - 0 = 3

0 - ( - 2 ) = 0 + 2 = 2

( - 4 ) - 0 = - 4