Tìm hai số a và b biết ti số của chúng là 4/7 và tích của chúng bằng 252
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13 tháng 4 2016
ta có\(\frac{a}{b}\)=\(\frac{4}{7}\)(1)
ta có a*b=252
a=252:b
thay a=252:b vào(1) ta có
\(\frac{252:b}{b}\)=\(\frac{4}{7}\)
suy ra (252:b)*7=b*4
1764:7b=4b
1764:7b*7b=4b*7b
1764=28b
b=1764:28
b=63
nên a=\(\frac{4}{7}\)*63
a=36
còn 1 trường hợp nữa là a=-36;b=-63 bạn tự làm nhé
8 tháng 12 2015
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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29 tháng 10 2016
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