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Calculați:
a)|+5|+|-9|-|-3|+|+8|=?
b)1-2+3-4+5-6+.....+101-102=?

plzz.


Răspuns :

[tex]a)\quad |+5|+|-9|-|-3|+|+8|=\\ \\ =(5)+(9)-(3)+(8) = \\ \\ = 5+9-3+8 = 14+5 = 19[/tex]

[tex]b)\quad 1-2+3-4+5-6+...+101-102= \\ \\ = -1-1-1- \underset{\text{de 56 ori}}{\underbrace{...}} - 1 = -56[/tex]