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Code:#include<stdio.h> #include<conio.h> #include<math.h> #include<process.h> void main() { float n,b; clrscr(); printf("Nhap gia tri n:"); scanf("%f",&n); if(n>400000) { printf("Nhap sai"); getch(); exit(1); } b=pow(n,2.0); printf("Gia tri binh phuong cua so n=%f",b); getch(); }