Răspunsuri

2014-11-09T13:28:31+02:00
(a+b)/2=72; a-b=72
a+b=144=>a=144-b
144-b-b=72=> -2b=72-144=> -2b= -72=>b= 36
a=144-36
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2014-11-09T13:32:10+02:00
 \frac{a+b}{2} =142⇒a+b=142·2
⇒a+b=284
a-b=72
(a+b)+(a-b)=356⇒2a=356⇒a=356÷2=178
⇒178+b=284
⇒b=284-178
⇒b=106
Deci
a=178
b=106
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