Bài 1:
5.22 + (x + 3) = 52
5.4 + (x + 3) = 25
20 + (x + 3) = 25
x + 3 = 5
x = 2
Vậy x = 2
26 + (5 + x) = 34
64 + (5 + x) = 81
5 + x = 17
x = 12
Vậy x = 12
34 - (x + 5) = 5.32
81 - (x + 5) = 5.9
81 - (x + 5) = 45
x + 5 = 36
x = 31
Vậy x = 31
72 - (15 + x) = 5.22
49 - (15 + x) = 5.4
49 - (15 + x) = 20
15 + x = 29
x = 14
Vậy x = 14
7(x + 5) + 14 = 73
7(x + 5) + 14 = 343
7(x + 5) = 329
x + 5 = 47
x = 42
Vậy x = 42
72 - 7(13 - x) = 14
49 - 7(13 - x) = 14
7(13 - x) = 35
13 - x = 5
x = 8
Vậy x = 8
9x + 2.32 = 34
9x + 2.9 = 81
9x + 18 = 81
9x = 63
x = 7
Vậy x = 7
Bài 2:
(52001 - 52000) : 52000
= (51 + 2000 - 52000) : 52000
= (5.52000 - 52000) : 52000 P/s: 5.52000 - 1.52000 -> (5-1).52000
= (5-1).52000 : 52000
= 4.1
= 4
(57 + 59).(68 + 610).(24 - 42)
= (57 + 59).(68 + 62+8).[24 - (22)2]
= (57 + 59).(68 + 62.68).(24 - 24)
= (57 + 59).(1 + 62).68.0 P/s: 1.68 + 62.68 -> (1+62).68
= 57 + 59.(1 + 36).68.0
= 57 + 59.37.68.0
= 57 + 0 P/s: 59.37.68.0 = 0
= 57
5.2^2+(x+3)=5^2
=> 5 . 4 + ( x + 3 ) = 25
=> 20 + ( x + 3 ) = 25
=> x + 3 = 5
=> x = 8
2^6+(5+x)=3^4
=> 64 + ( 5 + x ) = 81
=> 5 + x = 17
=> x = 12
3^4-(x+5)=5.3^2
81 - ( x + 5 ) = 45
x + 5 = 36
x = 31
7^2-(15+x)=5.2^2
49 - ( 15 +x ) = 20
15 + x = 29
7(x+5)+14=7^3
7( x + 5 ) + 14 = 343
7 ( x + 5 ) = 329
x + 5 = 47
x = 42
7^2-7(13-x)=14
49 - 7( 13 - x ) = 14
7( 13 - x ) = 35
13 - x = 5
x = 8
9x+2.3^2=3^4
9x + 18 = 81
9x = 63
x = 7
Còn bài 2 bạn kia làm đúng rồi đó
Study well