9,6 x 13,8 +13,8 x 0,4

=13,8 x (9,6 +0,4)

=13,8 x 10

= 138

2^2023

2 x A = 1- 1/2027

A=1013/2027

73 The Haunted Theatre is frighttening but children love it

74 He plays foot ball well

75 How about living in an apartment in the future

76 There are seven continents in the world

77 If Tim didn't break his arm,he could battle in the final

78 Let's raise fund for the charity this weekend

79 If we get there early,we'll be able to get tickets

80 We didn't go out because it rained heavily

81 Despite his broken leg he tried to get out of the car

82 I can run faster than my friend 

83 Although Jenny took a taxi she arrived late for interview

45 x 34 + 45 x 65 + 45

=45 x (34 + 65 + 1)

=45 x 100

=4500

71 347 113

30-x:2=19

x:2=30-19

x:2=11

x=11x2

x=22

2.x+3=8

2x=8-3

2x=5

x=5:2

x=5/2

55

575(dư 164)