tìm 2stn a,b biết tích của chúng là 891 và ƯCLN là 3
tìm 2stn a,b biết rằng a-b = 15 và BCNN =90
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a) goi hai so la a ; b va a >b
vi UCLN(a,b)=18=>a=18k ; b=18q (trong do UCLN (k,q)=1 va k>q)
=>a+b=162
18k+18q =162
18(k+q)=162
k+q=9
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