是算24点得吧?

1:7 + 9 × 2 - 1

2:(7 + 9 × 2) - 1

3:(7 + (9 × 2)) - 1

4:7 + (9 × 2) - 1

5:7 + (9 × 2 - 1)

6:7 + ((9 × 2) - 1)

7:7 + 2 × 9 - 1

8:(7 + 2 × 9) - 1

9:(7 + (2 × 9)) - 1

10:7 + (2 × 9) - 1

11:7 + (2 × 9 - 1)

12:7 + ((2 × 9) - 1)

13:7 × 2 + 9 + 1

14:(7 × 2) + 9 + 1

15:(7 × 2 + 9) + 1

16:((7 × 2) + 9) + 1

17:7 × 2 +(9 + 1)

18:(7 × 2) + (9 + 1)

19:7 × 2 + 1 + 9

20:(7 × 2) + 1 + 9

21:(7 × 2 + 1) + 9

22:((7 × 2) + 1) + 9

23:7 × 2 +(1 + 9)

24:(7 × 2) + (1 + 9)

25:7 - 1 + 9 × 2

26:(7 - 1) + 9 × 2

27:7 - 1 +(9 × 2)

28:(7 - 1) + (9 × 2)

29:7 - (1 - 9 × 2)

30:7 - (1 - (9 × 2))

31:7 - 1 + 2 × 9

32:(7 - 1) + 2 × 9

33:7 - 1 +(2 × 9)

34:(7 - 1) + (2 × 9)

35:7 - (1 - 2 × 9)

36:7 - (1 - (2 × 9))

37:9 + 7 × 2 + 1

38:(9 + 7 × 2) + 1

39:(9 + (7 × 2)) + 1

40:9 + (7 × 2) + 1

41:9 + (7 × 2 + 1)

42:9 + ((7 × 2) + 1)

43:9 + 2 × 7 + 1

44:(9 + 2 × 7) + 1

45:(9 + (2 × 7)) + 1

46:9 + (2 × 7) + 1

47:9 + (2 × 7 + 1)

48:9 + ((2 × 7) + 1)

49:9 × 2 + 7 - 1

50:(9 × 2) + 7 - 1

51:(9 × 2 + 7) - 1

52:((9 × 2) + 7) - 1

53:9 × 2 +(7 - 1)

54:(9 × 2) + (7 - 1)

55:9 × 2 - 1 + 7

56:(9 × 2) - 1 + 7

57:(9 × 2 - 1) + 7

58:((9 × 2) - 1) + 7

59:9 × 2 -(1 - 7)

60:(9 × 2) - (1 - 7)

61:9 + 1 + 7 × 2

62:(9 + 1) + 7 × 2

63:9 + (1 + 7 × 2)

64:9 + (1 + (7 × 2))

65:9 + 1 +(7 × 2)

66:(9 + 1) + (7 × 2)

67:9 + 1 + 2 × 7

68:(9 + 1) + 2 × 7

69:9 + (1 + 2 × 7)

70:9 + (1 + (2 × 7))

71:9 + 1 +(2 × 7)

72:(9 + 1) + (2 × 7)

73:2 × 7 + 9 + 1

74:(2 × 7) + 9 + 1

75:(2 × 7 + 9) + 1

76:((2 × 7) + 9) + 1

77:2 × 7 +(9 + 1)

78:(2 × 7) + (9 + 1)

79:2 × 7 + 1 + 9

80:(2 × 7) + 1 + 9

81:(2 × 7 + 1) + 9

82:((2 × 7) + 1) + 9

83:2 × 7 +(1 + 9)

84:(2 × 7) + (1 + 9)

85:2 × 9 + 7 - 1

86:(2 × 9) + 7 - 1

87:(2 × 9 + 7) - 1

88:((2 × 9) + 7) - 1

89:2 × 9 +(7 - 1)

90:(2 × 9) + (7 - 1)

91:2 × 9 - 1 + 7

92:(2 × 9) - 1 + 7

93:(2 × 9 - 1) + 7

94:((2 × 9) - 1) + 7

95:2 × 9 -(1 - 7)

96:(2 × 9) - (1 - 7)

97:1 + 7 × 2 + 9

98:(1 + 7 × 2) + 9

99:(1 + (7 × 2)) + 9

100:1 + (7 × 2) + 9

101:1 + (7 × 2 + 9)

102:1 + ((7 × 2) + 9)

103:1 + 9 + 7 × 2

104:(1 + 9) + 7 × 2

105:1 + (9 + 7 × 2)

106:1 + (9 + (7 × 2))

107:1 + 9 +(7 × 2)

108:(1 + 9) + (7 × 2)

109:1 + 9 + 2 × 7

110:(1 + 9) + 2 × 7

111:1 + (9 + 2 × 7)

112:1 + (9 + (2 × 7))

113:1 + 9 +(2 × 7)

114:(1 + 9) + (2 × 7)

115:1 + 2 × 7 + 9

116:(1 + 2 × 7) + 9

117:(1 + (2 × 7)) + 9

118:1 + (2 × 7) + 9

119:1 + (2 × 7 + 9)

120:1 + ((2 × 7) + 9)

7,9,2,3的24点答案：

1:(7 + 9) ÷ 2 × 3

2:((7 + 9) ÷ 2) × 3

3:(7 + 9) ÷ (2 ÷ 3)

4:(7 + 9) × 3 ÷ 2

5:((7 + 9) × 3) ÷ 2

6:(7 + 9) × (3 ÷ 2)

7:(7 - 2) × 3 + 9

8:((7 - 2) × 3) + 9

9:(7 × 3 - 9) × 2

10:((7 × 3) - 9) × 2

11:9 + (7 - 2) × 3

12:9 + ((7 - 2) × 3)

13:(9 + 7) ÷ 2 × 3

14:((9 + 7) ÷ 2) × 3

15:(9 + 7) ÷ (2 ÷ 3)

16:(9 + 7) × 3 ÷ 2

17:((9 + 7) × 3) ÷ 2

18:(9 + 7) × (3 ÷ 2)

19:9 - (2 - 7) × 3

20:9 - ((2 - 7) × 3)

21:9 + (3 × (7 - 2))

22:9 + 3 ×(7 - 2)

23:9 - (3 × (2 - 7))

24:9 - 3 ×(2 - 7)

25:2 × (7 × 3 - 9)

26:2 × ((7 × 3) - 9)

27:2 × (3 × 7 - 9)

28:2 × ((3 × 7) - 9)

29:(3 × (7 + 9)) ÷ 2

30:3 × (7 + 9) ÷ 2

31:3 × ((7 + 9) ÷ 2)

32:(3 × 7 - 9) × 2

33:((3 × 7) - 9) × 2

34:(3 × (7 - 2)) + 9

35:3 × (7 - 2) + 9

36:(3 × (9 + 7)) ÷ 2

37:3 × (9 + 7) ÷ 2

38:3 × ((9 + 7) ÷ 2)

39:3 ÷ 2 ×(7 + 9)

40:(3 ÷ 2) × (7 + 9)

41:3 ÷ (2 ÷ (7 + 9))

42:3 ÷ 2 ×(9 + 7)

43:(3 ÷ 2) × (9 + 7)

44:3 ÷ (2 ÷ (9 + 7))