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Cusnir2002
a fost răspuns

111+2x+29=10³         9+2(14-y)=15       5x+52-31=30²-19

Răspuns :

CarMina03
111+2x+29=10³2x+150=1000
2x=1000-150
2x=850
x=425
 9+2(14-y)=15 2(14-y)=15-9
28-2y=6
28-6=2y
22=2y=y=22:2
y=11
5x+52-31=30²-19

5x+21=900-19
5x+21=881
5x=881-21
5x=860
x=860:5
x=172