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  1.  
  2. //// Exercise 1
  3. {
  4.     let a = 20;
  5.     let b = 15;
  6.     if ( a > b){
  7.         console.log("Max is a " + a );
  8.     }
  9.     else{
  10.         console.log("Max is b " + b );
  11.  
  12.     }
  13. }
  14.  
  15. //// Exercise 2
  16. {
  17.     let year = 2020;
  18.     if (( year % 4 == 0 && year % 100 != 0 && year % 400 == 0 )){
  19.         console.log(`${year} is leap year`);
  20.     }
  21.     else{
  22.         console.log(`${year} is leap year`);
  23.     }
  24. }
  25.  
  26. ///// Exercise 3
  27. {
  28. let a = 1, b = 3, c = 2;
  29. //// ax^2 + bx + c = 0
  30. let d = b * b - (4 * a * c);
  31. if (d > 0){
  32.     let answ1 = ((-1*b) + (Math.sqrt(d))) / (2*a);
  33.     let answ2 = ((-1*b) - (Math.sqrt(d))) / (2*a);
  34.     console.log(`First answer is ${answ1} and Second answer is ${answ2} `);
  35. }else if ( d === 0){
  36.     let answ = ( -1 * b) / (2 * a);
  37. }else {
  38.     console.log("No solution");
  39. }
  40.  
  41. }
  42.  
  43. //// Exercise 4
  44. {
  45. let a = 4, b = 5, c = 7;
  46. if ( a > b && a > c){
  47.     console.log(`Maximum between a, b, c is ${a}`);
  48. }else if ( b > a && b > c){
  49.     console.log(`Maximum between a, b, c is ${b}`);
  50. }else{
  51.     console.log(`Maximum between a, b, c is ${c}`);
  52. }
  53. }
  54.  
  55. //// Exercise 5
  56. {
  57.     let x = -1, y = 2;
  58.     if ( 3 * x + y * 2 + 1 == 0 ){
  59.         console.log("YES");
  60.     }else{
  61.         console.log("NO");
  62.     }
  63. }
  64.  
  65. //// Exercise 6
  66. {
  67.     let a = 4, b = 3, c = 8;
  68.     if ( a + b > c && b + c > a && a + c > b){
  69.      console.log("YES");
  70.     }else("NO");
  71.     console.log("NO");
  72.    
  73. }
  74. ///// Home work
  75. {
  76.     let purchase1 = 500, purchase2 = 60000, purchase3 = 2500;
  77.     let sum = purchase1 + purchase2 + purchase3;
  78.     let cashback;
  79.     if ( sum <= 1000 ){
  80.         cashback = sum * 15 / 100;
  81.     }else if ( sum <= 3000){
  82.         cashback = sum * 10 / 100;
  83.     }else ( cashback = sum * 15 / 100);
  84.     if ( cashback <= 3000){
  85.         console.log(cashback+" your cashback");
  86.     } else if ( cashback > 3000){
  87.         console.log("cashback > 3000 " +  `Ваш кешбек больше 3000`);
  88.     }
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