Question

Ajutor la problema 9

Answer 1

a) -9-(-6)+8 = -9+6+8 = -3+8 = 5
b) -1-(+3)-6 = -1-3-6 = -10
c) +12-(-9)-2 = 12+9-2 = 19
d) 6-(-4)+10 = 6+4+10 = 10
e) -21-(+17)-(-2) = -21-17+2 = -38+2 = -36
f) 0-(-8)-(+8) = 8-8 = 0
g) 11-(-9)-(+5) = 11+9-5 = 20-5 = 15
h) 4-(+3)+(-7) = 4-3-7 = 1-7 = -6
i) 0-(+9)+(-9)= -9-9 = -18
j) -6 - [(-4)-(-5)] = -6 - (-4+5) = -6-1 = -7
k) -4-(10+3) = -4-13 = -17
l) -[9-(-9)]-5 = -18-5 = -23

REGULA SEMNELOR
n = numar
-(+x) = -x
+(-x) = -x
-(-x) = x
+(+x) = x 
acelasi lucru la inmultire
(+) × (-) = -
(-) × (+) = -
(+) × (+) = +
(-) × (-) = -