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a, 450 - 5x = 75
5x = 450 - 75
5x = 375
x = 75
Vậy...
b, ( 450 - 5x ) . 15 = 75
450 - 5x = 5
5x = 445
x = 89
Vậy ...
c, ( 450 - x ) : 15 = 150
450 - x = 2250
x = 450 - 2250
x = -1800
Vậy...
a) 450 -5 x X =75 b) ( 450 - 5 x X ) x15 =75 c) ( 450 - X ) : 15 =150
5 x X =450-75 450 - 5 x X =75 : 15 450 - X =150x15
5 x X =375 450 - 5 x X =5 450 - X =2250
X=375:5 5 x X =450:5 X =450-2250
X=75 5 x X =90 X =-1800
X =90:5
X =18
(2x-15)5=(2x-15)3
=> 2x-15=0 hoặc 2x-15=1 (vì 05=03)
=> 2x=0+15 hoặc 2x=1+15
=> 2x=15 hoặc 2x=16
=> x=15:2 hoặc x=16:2
=> x=7,5 hoặc x=8
Vậy x = 7,5 hoặc x = 8
a: \(20-\left[30-\left(5-1\right)^2\right]\)
\(=20-\left[30-4^2\right]\)
\(=20-14=6\)
b: \(71+\dfrac{50}{5+3\left(57-6\cdot7\right)}\)
\(=71+\dfrac{50}{5+3\cdot\left(57-42\right)}\)
\(=71+\dfrac{50}{5+3\cdot15}=71+\dfrac{50}{50}=72\)
c: \(4\cdot\left\{270:\left[50-\left(2^5+45:5\right)\right]\right\}\)
\(=4\cdot\left\{270:\left[50-32-9\right]\right\}\)
\(=4\cdot\left\{\dfrac{270}{50-41}\right\}=4\cdot\dfrac{270}{9}=4\cdot30=120\)
d: \(411-\left[\dfrac{\left(107+3\right)}{5}-2^2\right]\)
\(=411-\left[\dfrac{110}{5}-4\right]\)
=410-22+4
=410-18
=392
e: \(450-5\left[3^2\left(7^5:7^3-41\right)-12\right]+18\)
\(=450-5\left[9\cdot\left(7^2-41\right)-12\right]+18\)
\(=450-5\cdot\left[9\cdot8-12\right]+18\)
=468-5*60
=468-300
=168
f:
\(102-150:\left[18-2\cdot\left(10-8\right)^2\right]+1018^0\)
\(=102-150:\left[18-2\cdot4\right]+1\)
\(=103-\dfrac{150}{18-8}=103-15=88\)
Ta có : 5 + ( 2x - 1 ) = -6 - ( 5 + x )
=> 5 + 2x - 1 = -6 - 5 - x
=> 4 + 2x = -x - 11
=> 2x + x = -11 - 4
=> 3x = -15
=> x = ( -15 ) : 3 = -5
\(\dfrac{5}{4x}-\dfrac{3}{2}=\dfrac{3}{2}+\dfrac{x}{2}\\ \Leftrightarrow5-6x=6x+2x^2\\ \Leftrightarrow2x^2+12x-5=0\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{-6+\sqrt{46}}{2}\\x=\dfrac{-6-\sqrt{46}}{2}\end{matrix}\right.\)
(25-2X)^3:5-3^2=4^2
(25-2X)^0,6-9=16
(25-2X)^0,6=16+9=25
..............................
=>x=-94,37349667
a) => x : 80 = 2
=> x = 160
b) => 200/15 : x = 3
=> x = 40/9
c) => 158 - x = 140
=> x = 18
d) => 231 - (x-6) = 103
=> x - 6 = 128
=> x = 134
(1+3+5+7+...+1995)+2x=996006
[(1995+1).998 : 2] + 2x = 996006
996004+2x=996006
=> 2x = 2
=> x=1
(1+3+5+7+...+1995)+2x=996006
[(1995+1).998 : 2] + 2x = 996006
996004+2x=996006
=> 2x = 2
=> x=1
\(5\frac{1}{2}-5\frac{1}{3}.\left(\frac{3}{2}.x-\frac{1}{3}\right)=1\frac{1}{2}\)
\(\frac{16}{3}\left(\frac{3}{2}.x-\frac{1}{2}\right)=5\frac{1}{2}-1\frac{1}{2}=4\)
\(\frac{3}{2}x-\frac{1}{2}=4:\frac{16}{3}=\frac{4}{3}\)
\(\frac{3}{2}x=\frac{4}{3}+\frac{1}{2}=\frac{11}{6}\)
\(x=\frac{11}{6}:\frac{3}{2}\)
\(x=\frac{11}{9}\)
$450-2\times x=75:5-5$
$\Rightarrow 450-2\times x=15-5$
$\Rightarrow 450-2\times x=10$
$\Rightarrow 2\times x=450-10$
$\Rightarrow 2\times x=440$
$\Rightarrow x=440:2$
$\Rightarrow x=220$
450 - 2 x X = 15 - 5
450 - 2 x X =10
2 x X = 450 - 10
2 x X = 440
X = 440 : 2
X = 220