Question

determinati fractia a pe b stiind ca este egala cu fractia 7pe 5 si ca a × b=1260

Answer 1

$\frac{a}{b} = \frac{7}{5};a=7k;b=5k. \\ a*b=7k*5k=35 k^{2}=1260 \\ k^{2}= \frac{1260}{35}=36 \\ k=6;a=42;b=30$

Answer 2

a/b=7/5
a*b=1260=>a=1260/b
(1260/b)/b=7/5
b^2=900
b=30 in caz nostru
a*b=1260
a*30=1260
a=1260:30
a=42