Bạn tham khảo:
$1/$
Tỏng: $2p+n=290(1)$
MĐ > KMĐ: $2p-n=38(2)$
$(1)(2)$
$p=e=82$
$n=126$
$2/$
Tổng: $2p+n=180(1)$
Tir leej; $\frac{2p}{n}=\frac{53}{37}$
$\to 37.2p=53n$
$\to 74p-53n=0(2)$
$(1)(2)$
$p=e=53$
$n=74$
$3/$
$X$:
Tổng: $2p+n=18$
$\frac{18}{3,5} \leq p \leq \frac{18}{3}$
$5,14 \leq p \leq 6$
$\to p=6 \to n=6$
$Y$
Tổng: $2p+n=20$
$\frac{20}{3,5} \leq p \leq \frac{20}{3}$
$5,7 \leq p \leq 6,6$
$\to p=6 \to n=6$
