Rút gọn phân số:
$\dfrac{200}{100}$ =$\dfrac{200:100}{100:100}$ =$\dfrac{2}{1}$ =$2$
$\dfrac{248}{658}$ = $\dfrac{248:2}{658:2}$ =$\dfrac{124}{329}$
Bài 2:Tìm x
$Xx8658=60606$
$X =60606:8658$
$X=7$
Vậy x=7
$x:75487657=7$
$x=7×75487657$
$x=528413599$
Vậy x=528413599