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rezolvati in multimea Z ecuatia:
IxI=18
I2x-3I=7
IxI=-2
I5-8xI=35


Răspuns :

lxl=18 =>  x=+/-18 x1=-18, x2=18
l2x-3l=7  2x-3=+/-7  x1=(-7+3)/2= -4/2=-2 , x2= (7+3)/2=5
lxl=-2 imposibil  pt  ca  lxl≥0
l5-8xl=35
5-8x=+/-35  x1=(-35-5)/_8=5  x2=(35-5)/_8=30/-8=- 15/4