a. (5.x + 3) : 4 – 16 = 6
(5.x + 3) : 4 = 22
(5.x + 3) = 88
5.x = 85
x = 13
b. 7(23 – 3.x) : 2 – 35 = 35
7(23 – 3.x) : 2 = 70
7(23 – 3.x) = 35
7 . 3.x = 12
7.x = 4
x = 4/7
a.) (5.x + 3) : 4 – 16 = 6
=> (5.x + 3) : 4 = 22
=> 5.x + 3 = 88
=> 5x = 85
=> x = 17
b) 7(23 – 3.x) : 2 – 35 = 35
=> 7(23 – 3.x) : 2 = 70
=>7(23 – 3.x) = 140
=> 23 – 3.x = 20
=> 3x = 3
=> x = 1
a. (5.x + 3) : 4 – 16 = 6
=> (5.x + 3) : 4 = 22
=> (5.x + 3) = 88
5.x = 85
x = 13
b. 7(23 – 3.x) : 2 – 35 = 35
=> 7(23 – 3.x) : 2 = 70
=> 7(23 – 3.x) = 35
=> 7 . 3.x = 12
7.x = 4
x = 4/7
hok tốt
sai thì thông cảm
Bài 5. Tìm x biết :
a. (5.x + 3) : 4 – 16 = 6
( 5.x + 3 ) : 4 = 6 + 16
( 5.x + 3 ) : 4 = 22
5.x + 3 = 22 . 4
5x + 3 = 88
5x = 88 - 3
5x = 85
x = 85 : 5
x = 17
b. 7(23 – 3.x) : 2 – 35 = 35
7.( 23 - 3x ) : 2 = 35 + 35
7.( 23 - 3x ) : 2 = 70
7.( 23 - 3x ) = 70 . 2
7.( 23 - 3x ) = 140
23 - 3x = 140 : 7
23 - 3x = 20
3x = 23 - 20
3x = 3
x = 3 : 3
x = 1
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