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24 tháng 3 2016
hiệu của a và b là:50x2=100
hiệu lúc sau của a và b là:100-30x2=40
số bé lúc sau là:(5-1):2=4(phần)
tuwj tinhs tieeps
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6 tháng 3 2022
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\(\dfrac{a-6}{b+3}=2\)
\(\Leftrightarrow a-6=2b+6\)
\(\Leftrightarrow a-2b=12\)