450-2xX=75:5-5
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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
\(a)\) \(2x-5=21\)
\(\Leftrightarrow\) \(2x=21+5\)
\(\Leftrightarrow\) \(2x=26\)
\(\Leftrightarrow\) \(x=26:2\)
\(\Leftrightarrow\) \(=13\)
\(b)\) \(\frac{3}{4}+\frac{1}{4}x=\frac{5}{6}\)
\(\Leftrightarrow\) \(\frac{1}{4}x=\frac{5}{6}-\frac{3}{4}\)
\(\Leftrightarrow\) \(\frac{1}{4}x=\frac{1}{12}\)
\(\Leftrightarrow\) \(x=\frac{1}{3}\)
720:[41-(2xX-5)]=40
41-(2xX-5)=720:40
41-(2xX-5)=18
2xX-5=41-18
2xX-5=23
2xX=23+5
2xX=28
X=28:2
X=14
Vây X=14.
Nếu đúng bạn **** cho mình nhé.
720:[41-(2xX-5)]=8x5 = 40.
cho [41-(2xX-5)] = x .
theo đề ta có : 720 : 40 = x
x = 18 => [41-(2xX-5)] = 18 .
( 2xX-5 ) = 41 - 18
( 2xX-5 ) = 23
2xX = 23 + 5
2xX = 28
suy ra : X = 28 : 2
X = 14
\(\left(2\cdot x-3\right)\cdot3-5=10\)
\(\left(2x-3\right)\cdot3=15\)
\(2x-3=5\)
\(2x=8\)
\(x=4\)
\(\left(2\times x-3\right):3-5=10\)
\(\left(2\times x-3\right)\times3=10+5\)
\(\left(2\times x-3\right)\times3=15\)
\(2\times x-3=15:3\)
\(2\times x-3=5\)
\(2\times x=5-3\)
\(2\times x=2\)
\(x=2:2\)
\(x=1\)
$450-2\times x=75:5-5$
$\Rightarrow 450-2\times x=15-5$
$\Rightarrow 450-2\times x=10$
$\Rightarrow 2\times x=450-10$
$\Rightarrow 2\times x=440$
$\Rightarrow x=440:2$
$\Rightarrow x=220$
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