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\(2\times\left(x-51\right)=2\times2^3+20\)
\(2\times\left(x-51\right)=2^4+20\)
\(2\times\left(x-51\right)=16+20\)
\(2\times\left(x-51\right)=36\)
\(x-51=36:2\)
\(x-51=18\)
\(x=18+51\)
\(x=69.\)
\(70-5\times\left(x-3\right)=45\)
\(5\times\left(x-3\right)=70-45\)
\(5\times\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8.\)
15.x+2.x=45+20:5
(15+2).x=45+4
17.x=49
x=49 : 17
x= \(\frac{49}{17}\)
a, x + 350 : x = 93 - 45 : 2
=> x + 350 : x = 93 - 22,5
=> x + 350 : x = 70,5
=> ?
a, 72-(4.x+15)=45 con cau b khong lam dc
4.x+15=72-45
4.x+15=27
4.x=27-15
4.x=8
x=8:4
x=2
a)45-5 ( x - 2 ) = 20
5 ( x - 2 )=45-20
5 (x - 2 )=25
x - 2=25/5
x - 2=5
x = 5+2
x=7
b)3 (x-4)+24=96
3 (x-4)=96-24
3 (x-4)=72
x-4=72/3
x-4=24
x=24+4
x=28
\(\left(27.700-45.20\right)\div\left(45-40+35-30+25-20+15-10+5\right)\)
\(=\)\(\left(27.100-45.20\right)\div25\)
\(=\)\(\left(27.35.20-45.20\right)\div25\)
\(=\)\(\left[\left(27.35-45\right).20\right]\div25\)
\(=\)\(18000\div25\)
\(=\)\(750\)
(x-15):5+20=22
(x-15):5=22-20
(x-15):5=2
x-15=2x5
x-15=10
x=10+15
x=25
64+(20-3x)=75
20-3x=75-64
20-3x=11
3x=20-11
3x=9
x=9:3
x=3
[(6x-39):3].28=5628
(6x-39):3=5628:28
(6x-39):3=201
6x-39=201x3
6x-39=603
6x=603+39
6x=642
x=642:6
x=107
400-[545-(45+x)]=0
545-(45+x)=400-0
545-(45+x)=400
45+x=545-400
45+x=145
x=145-45
x=100
(111:x+25):14=2
111:x+25=2x14
111:x+25=28
111:x=28-25
111:x=3
x=111:3
x=37
a/ \(\Rightarrow\left(x-15\right):5=2\Rightarrow x-15=10\Rightarrow x=25\)
b/ \(\Rightarrow20-3x=11\Rightarrow3x=9\Rightarrow x=3\)
c/ => \(\left(6x-39\right):3=201\Rightarrow6x-39=603\Rightarrow6x=642\Rightarrow x=107\)
d/ \(\Rightarrow545-\left(45+x\right)=400\Rightarrow45+x=145\Rightarrow x=100\)
e/ \(\Rightarrow111:x+25=28\Rightarrow111:x=3\Rightarrow x=\frac{111}{3}\)
a, \(\frac{x}{5}=\frac{-12}{20}\)
\(x=\frac{5.\left(-20\right)}{20}\)
\(x=-5\)
b, 3x - 35 = -45 - 2x
3x + 2x = -45 + 35
5x = -10
x = (-10) : 5
x = -2
c, \(\frac{-1}{6}-x=\frac{5}{12}+\frac{-2}{3}\)
\(\frac{-1}{6}-x=\frac{-1}{4}\)
\(-x=\frac{-1}{6}-\frac{-1}{4}\)
\(-x=\frac{1}{12}\)
\(x=\frac{-1}{12}\)
20 - 5 x (2 - x) = 45
x = 7
20 - 5 x (2 - x) = 45
5x (2 - x)= 20-45
5x (2 - x)= -25
(2 - x)=(-25) :5
2 - x= -5
x= 2-(-5)
x=2+5
x=7
Vậy x=7