a: =>25-x/5=4/5
=>25-x=4
hay x=21
b: =>x=1/36+11/12=1/36+33/36=34/36=17/18
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a\(\dfrac{25-x}{5}=\dfrac{112}{140}\)
<=>\(\dfrac{25-x}{5}=\dfrac{4}{5}\)
<=>25-x=4
<=>x=25-4=21
b)\(x-\dfrac{11}{12}=\dfrac{1}{36}\)
=>\(x=\dfrac{1}{36}+\dfrac{11}{12}=\dfrac{1}{36}+\dfrac{33}{36}=\dfrac{34}{36}=\dfrac{17}{18}\)
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