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\(a,210-5\left(x-11\right)=200\\ \Rightarrow5\left(x-11\right)=10\\ \Rightarrow x-11=2\\ \Rightarrow x=13.\\ b,\left(2x+1\right):7=2^2+3^2\\ \Rightarrow\left(2x+1\right):7=4+9\\ \Rightarrow\left(2x+1\right):7=13\\ \Rightarrow2x+1=91\\ \Rightarrow2x=90\\ \Rightarrow x=45.\\ c,450:\left[41-\left(2x-5\right)\right]=3^2.5\\ \Rightarrow450:\left[41-\left(2x-5\right)\right]=45\\ \Rightarrow41-\left(2x-5\right)=10\\ \Rightarrow2x-5=31\\ \Rightarrow2x=36\\ \Rightarrow x=18.\\ d,\left(5x-9\right).7+3=80\\ \Rightarrow\left(5x-9\right).7=77\\ \Rightarrow5x-9=11\\ \Rightarrow5x=20\\ \Rightarrow x=4.\)
a) \(210-5\left(x-11\right)=200\)
\(5.\left(x-11\right)=210-200\)
\(5.\left(x-11\right)=10\)
\(x-11=10:5\)
\(x-11=2\)
\(x=2+11\)
\(x=13\)
b) \(\left(2x+1\right):7=2^2+3^2\)
\(\left(2x+1\right):7=13\)
\(2x+1=13.7\)
\(2x=91-1\)
\(2x=90\)
\(x=90:2\)
\(x=45\)
c) \(450:\left[41-\left(2x-5\right)\right]=3^2.5\)
\(450:\left[41-\left(2x-5\right)\right]=45\)
\(\left[41-\left(2x-5\right)\right]=450:45\)
\(\left[41-\left(2x-5\right)\right]=10\)
\(2x-5=41-10\)
\(2x-5=31\)
\(2x=31+5\)
\(2x=36\)
\(x=36:2\)
\(x=18\)
d) \(\left(5x-9\right).7+3=80\)
\(\left(5x-9\right).7=80-3\)
\(5x-9=77:7\)
\(5x-9=11\)
\(5x=11+9\)
\(5x=20\)
\(x=20:5\)
\(x=4\)
\((5x-39)\cdot7+3=80\\\Rightarrow (5x-39)\cdot7=80-3\\\Rightarrow (5x-39)\cdot7=77\\\Rightarrow 5x-39=77:7\\\Rightarrow 5x-39=11\\\Rightarrow5x=11+39\\\Rightarrow5x=50\\\Rightarrow x=50:5=10\\Vậy:x=10\)
(5x - 39).7 + 3 = 80
(5x - 39).7 = 80 - 3
(5x - 39).7 = 77
5x - 39 = 77 : 7
5x - 39 = 11
5x = 11 + 39
5x = 50
x = 50 : 5
x = 10
Làm chi tiêt hơn ạ.
(5x - 39 ) . 7 + 3 = 80
( 5x - 39 ) .7 = 80 - 3
( 5x - 39 ) . 7 = 77
5x - 39 = 77:7
5x - 39 = 11
5x = 39 + 11
5x = 50
x = 50 : 5
x = 10
Vậy x = 10
a/ Ta có: |2x - 6| + 5x = 9 => |2x - 6| = 9 - 5x
=> 2x - 6 = 9 - 5x => 7x = 15 =>. x = 15/7
hoặc 2x - 6 = 15x - 9 => 13x = 3 => x = 3/13
Vậy x = 15/7 , x = 3/13
b/ |5x - 3| - x = 7 => |5x - 3| = x + 7
=> 5x - 3 = x + 7 => 4x = 10 => x = 5/2
hoặc 5x - 3 = -x - 7 => 6x = -4 => -2/3
Vậy x = 5/2 , x = -2/3
a)210-5x=200
5x=210-200
5x=10
x=10:2
x=5
B)210-5(x-10)=200
5(x-10)=210-200
5(x-10)=10
x-10=10:5=2
x=2+10=12
c)450:[41-(2x-5)]=3 mũ 2 .5
450:[41+5-2x]=45
41+5-2x=450:45
41+5-2x=10
2x=36
x=18
D)210:x-10=20
210:x=20+10
210:x=30
x=210:30
x=7
E)(5x-39).7+3=80
(5x-39).7=77
5x-39=11
5x=50
x=10
F(2x+1):7=2 mũ 2 nhân 3 mũ 2
(2x+1):7=36
2x+1=252
2x=251
x=251/2
( 5x - 9 ) . 7 + 3 = 80
( 5x - 9 ) . 7 = 80 - 3 = 77
5x - 9 = 77 : 7 = 11
5x = 11 + 9 = 20
x = 20 : 5 = 4
(5x-9).7+3 =80
=>(5x-9).7=77
=>5x-9=11
=>5x=20
=>x=4