$\texttt{Câu 1:}$

def kiem_tra_chan_le(n):
    if n % 2 == 0:
        return True
    else:
        return False

print(kiem_tra_chan_le(15))
print(kiem_tra_chan_le(20))

`" "`

$\texttt{Câu 2:}$

n = int(input('Nhap N = '))

tong = 0

for i in range(2, n + 1, 2):
    tong += i

print('Tong cac so chan =', tong)