Câu 29
a=int(input('a='))
b=int(input('b=')
chuvi=a*4
dientich=a*a
print(chuvi)
print(dientich)
Câu 30
a=int(input('a=')
b=int(input('b=')
tchan=0
tle=0
for i in range(a,b+1):
    if i %2==0:
        tchan+=i
    else:
        tle+=i
print(tchan)
print(tle)
        

Câu 29:

#include <bits/stdc++.h>

using namespace std;

long long a;

int main(){

cin >> a;

cout << a*4 <<" " << a*a;

}

Câu 30:

#include <bits/stdc++.h>

using namespace std;

long long a,b,s=0,d=0;

int main(){

cin >> a >> b;

if(a<b)

for(long long i=a;i<=b;i++)

if (i%2==0)

d+=i;

else

s+=i;

cout << d<<" " << s;

}