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\(=>\orbr{\begin{cases}\left(2x-3\right)^2=6^2\\\left(2x-3\right)^2=\left(-6\right)^2\end{cases}}\)
\(=>\orbr{\begin{cases}2x-3=6\\2x-3=-6\end{cases}}\)
\(=>\orbr{\begin{cases}2x=9\\2x=-3\end{cases}}\)
\(=>\orbr{\begin{cases}x=\frac{9}{2}\\x=-\frac{3}{2}\end{cases}}\)
( 2x - 3 ) ^2 = 36
(2x-3 ) ^2 = ( + - 6 ) ^2
-> 2x-3 = +- 6
* 2x -3 =6 * 2x -3 = -6
2x = 9 2x= -3
x= 9/2 x = -3 /2
vậy x \(\in\)( 9/2 : -3 /2 )
ý b ) tự làm nha bạn , nó còn dễ hơn 1^ 2
Tìm x biết
a) 14x + 27x + 13x = 3888
b) 1084 + ( 942 - 2x ) : 36 .14 = 1434
Giúp mk với các bn.Mk k cho
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b) 1084+(942-2x):16.14=1434
=>(942-2x):36.14=1434-1084
=>(942-2x):36.14=350
=>(942-2x):36=350:14
=>(942-2x):36=25
=>942-2x=25.36
=>942-2x=900
=>2x=942-900
=>2x=42
=>x=42:2
=>x=21
a) 14x+27x+13x=3888
=>(14+27+13)x=3888
=>54x=3888
=>x=3888:54
=>x=72
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(x-36).42=84.38-84.37
(x-36).42=84.(38-37)
(x-36).42=84.1
(x-36).42=84
x-36 =84-42
x-36 =42
x=42+36
x=78
NHỚ VIẾT DẤU BẰNG THẲNG NHAU NHA!
(x-36).42=84.38-84.37
(x-36).42=84.(38-37)
(x-36).42=84.1
(x-36).42=84
x-36=84:42
x-36=2
x=2+36
x=38
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-22<x<23=>x=(-21;-22...........22)
-36<x<34=>x=(-35;-34.........33)
rồi đó nhá
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a) x2 + 5x = 0
=> x.(x + 5) = 0
=> x = 0 hoặc x + 5 = 0
=> x = 0 hoặc x = -5
b) 1/21 + 1/28 + 1/36 + ... + 2/x(x + 1) = 2/9
=> 2/42 + 2/56 + 2/72 + ... + 2/x(x + 1) = 2/9
=> 2 × [1/6×7 + 1/7×8 + 1/8×9 + ... + 1/x(x + 1)] = 2/9
=> 1/6 - 1/7 + 1/7 - 1/8 + 1/8 - 1/9 + ... + 1/x - 1/x + 1 = 2/9 : 2
=> 1/6 - 1/x + 1 = 2/9 × 1/2 = 1/9
=> 1/x + 1 = 1/6 - 1/9
=> 1/x + 1 = 3/18 - 2/18
=> 1/x + 1 = 1/18
=> x + 1 = 18
=> x = 17
x=36:(-3)
x=-12