X si Y

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Amaranth
Thales
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Joined: Sun Oct 19, 2008 5:44 pm

X si Y

Post by Amaranth »

Aflati x si y stiind ca suma lor este 102, iar diferenta este 72. :wink:
In all this world there is only one pure and magic thing... and it is called PURPLE!
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miruna.lazar
Bernoulli
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Joined: Wed Oct 08, 2008 8:41 pm
Location: Tulcea

Post by miruna.lazar »

x + y = 102
x-y = 72

inlocuim x=72+y in prima relatie si avem

72 + y +y = 102
72 + 2y = 102
2y= 102- 72
2y= 30
y = 30 : 2 = 15


x = 102- 15
x= 87

proba: 87 + 15 = 102
87 - 15 = 72


( cam usoara ptr. clasa a V -a )
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