nguyen tuan anh
06/04/2018 at 13:56
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¤« 07/04/2018 at 14:39a + b = 273
a - b = 23
⇒
(a + b) - (a - b) = 250
2b = 250
b = 125
⇒
a = 273 - 125 = 158
<<< hope you learn well >>>
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Unknown account 06/04/2018 at 17:02a + b = 273
a - b = 23
\(\Rightarrow\) (a + b) - (a - b) = 250
2b = 250
b = 125
\(\Rightarrow\) a = 273 - 125 = 158
<<< hope you learn well >>>