2x - 49 = 5.32
200 -(2x + 6) = 43
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\(\left(1-x\right)\left(5x+3\right)=\left(3x-7\right)\left(x-1\right)\)
\(< =>\left(1-x\right)\left(5x+3+3x-7\right)=0\)
\(< =>\left(1-x\right)\left(8x-4\right)=0\)
\(< =>\orbr{\begin{cases}1-x=0\\8x-4=0\end{cases}< =>\orbr{\begin{cases}x=1\\x=\frac{1}{2}\end{cases}}}\)
\(\left(x-2\right)\left(x+1\right)=x^2-4\)
\(< =>\left(x-2\right)\left(x+1\right)=\left(x-2\right)\left(x+2\right)\)
\(< =>\left(x-2\right)\left(x+1-x-2\right)=0\)
\(< =>-1\left(x-2\right)=0\)
\(< =>2-x=0< =>x=2\)
\(2x-49=5.32\\ \Leftrightarrow2x-49=160\\ \Leftrightarrow2x=209\\ \Leftrightarrow x=\dfrac{209}{2}\)
\(200-\left(2x+6\right)=43\\ \Leftrightarrow2x+6=157\\ \Leftrightarrow2x=151\\ \Leftrightarrow x=\dfrac{151}{2}\)
\(135-5\left(x+4\right)=35\\ \Leftrightarrow5\left(x+4\right)=100\\ \Leftrightarrow x+4=20\\ \Leftrightarrow x=16\)
c). 135 - 5( x + 4 ) = 35.
135 - 5 . ( x +4) 35
5 . ( x + 4 ) = 135 - 35 = 100
x + 4 = 100 : 5 =20
x = 20 - 4 = 16
\(7^{2x-6}=49\\ \Rightarrow7^{2x-6}=7^2\\ \Rightarrow2x-6=2\\ \Rightarrow2x=8\\ \Rightarrow x=4\)
\(...\Rightarrow\left(2x-6\right)=4^9:4^7\)
\(\Rightarrow2x-6=4^2\)
\(\Rightarrow2x-6=16\)
\(\Rightarrow2x=22\)
\(\Rightarrow x=11\)
(2x-6). 47 = 49
2x-6 = \(\dfrac{4^9}{4^7}\)
2x = 16+6
x = \(\dfrac{22}{2}\)
x = 11
(2x - 6) . 4⁷ = 4⁹
2x - 6 = 4⁹ : 4⁷
2x - 6 = 4²
2x - 6 = 16
2x = 16 + 6
2x = 22
x = 22 : 2
x = 11
Sửa đề:
\(7^{2x-6}=49\)
\(7^{2x-6}=7^2\)
\(\Rightarrow2x-6=2\)
\(2x=2+6\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
Rut gon :
2x -6/8-6/56-6/140-6/260=43/52
2x-12/13 =43/52
2x =43/52+12/13
x = 7/4 : 2
x = 7/8
2x-49=5.9(m chuyển luôn về từ 32)
2x-49=45
2x=45+49
2x=94
x=94:2
x=47
vậy x=47
200-(2x+6)=64(m cũng làm như câu trên )
2x+6=200-64
2x+6=136
2x=136-36
2x=100
x=100:2
x=50
vậy x=50
2x - 49 = 45
2x = 49 + 45
2x = 94
94 : 2
X = 47