1 . TÌM X BIẾT : [(8x - 12) : 4] . 3 = 36
tìm số nguyên x, biết:
a) -2x 12 = 8 - 6x + 60
b) -8x - 36 = ( x + 13) + ( - 8x + 3)
c) 1 + x - 10 - 6x - 4 - 5x
d) 6 - 3x + 1 = - 3x + 7
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Tìm x
a) [( 8x - 12 ) : 4] .33=36
b) 41 - 2x+1 = 9
\(a.\left[\left(8x-12\right):4\right]\cdot3^3=3^6\\ \left(8x-12\right):4=3^6:3^3\\ \left(8x-12\right):4=27\\ 8x-12=27\cdot4\\ 8x-12=108\\ 8x=108+12\\ 8x=120\\ x=15\\ b.41-2^{x+1}=9\\ 2^{x+1}=32\\ 2^{x+1}=2^5\\=> x+1=5\\ =>x=4\)
a,[(8x-12):4].33=36
(8x-12):4=36:33
(8x-12):4=33
(8x-12):4=9
8x-12=9.4
8x-12=36
8x=36+12
8x=48
x=6
Vậy x=6
b,41-2x+1=9
2x+1=41-9
2x+1=32
2x+1=25
x+1=5
x=5-1
x=4
Vậy x=4
Chúc bạn học tốt:33
tìm số tự nhiên x biết ( 8x-12):4.33=36
(8x-12):4.33=36
2x - 3 = 36:33
2x-3 = 33
2x-3 = 27
2x = 27 + 3
2x = 30
x = 30:2
x=15
Vậy x thuộc {15}
chúc bạn làm bài tốt:D
\(\left(8x-12\right):4\cdot3^3=3^6\\ \Rightarrow\left(8x-16\right):4=3^6:3^3\\ \Rightarrow\left(8x-16\right):4=3^3\\ \Rightarrow8x-16=27\cdot4\\ \Rightarrow8x-16=108\\ \Rightarrow8x=108+16\\ \Rightarrow8x=124\\ \Rightarrow x=124:8\\ \Rightarrow x=\dfrac{131}{2}\)
a. 219 - 7(x + 1) = 100 b. ( 3x - 6).3 = 36 c. 716 - (x - 143) = 659
d. 30 - [4(x - 2) + 15] = 3 e. [(8x - 12) : 4].33 = 36
a.219 - 7(x+1) = 100
7(x+1) = 219 - 100
7(x+1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
b. (3x - 6 ) . 3 = 36
3x - 6 = 36 : 3
3x - 6 = 12
3x = 12 + 6
3x = 18
x = 18 : 3
x = 6
c.716 - ( x-143) = 659
x-143 = 716 - 659
x-143 = 57
x = 57 + 143
x = 200
b. 30 - [4(x-2)+15] = 3
4(x-2) + 15 = 30 - 3
4(x-2)+15 = 27
4(x-2) = 27 - 15
4(x-2) = 12
x-2 = 12 : 4
x-2 = 3
x = 2 + 3 = 5
e.[(8x - 12) : 4] .33 = 36
[(8x - 12) : 4] . 27 = 729
(8x - 12) : 4 = 729 : 27 = 27
8x - 12 = 27 . 4 = 108
8x = 108 + 12 = 120
x = 120 : 8 = 15
a) \(\Leftrightarrow7\left(x+1\right)=119\\ \Leftrightarrow x+1=17\\ \Leftrightarrow x=16\)
b) \(\Leftrightarrow9\left(x-2\right)=36\\ \Leftrightarrow x-2=4\\ \Leftrightarrow x=6\)
c) \(\Leftrightarrow x-143=57\\ \Leftrightarrow x=200\)
d) \(\Leftrightarrow4\left(x-2\right)+15=27\\ \Leftrightarrow4\left(x-2\right)=12\\ \Leftrightarrow x-2=3\\ \Leftrightarrow x=5\)
e) \(\Leftrightarrow\left(2x-3\right).4:4=3^3\\ \Leftrightarrow2x-3=27\\ \Leftrightarrow2x=24\\ \Leftrightarrow x=12\)
a. 219 - 7(x + 1) = 100 b. ( 3x - 6).3 = 36 c. 716 - (x - 143) = 659
7(x+1)=119 3x-6=12 716-x+143=659
x+1=17 3x=18 859-x=659
x=16 x=6 x=200
d. 30 - [4(x - 2) + 15] = 3 e. [(8x - 12) : 4].33 = 36
4(x-2)+15=27 (8x-12):4=27
4(x-2)=12 8x-12=6,75
x-2=3 8x=18,75
x=5 x=\(\dfrac{75}{32}\)
Tìm số tự nhiên x,biết:
a)58 + 7x = 100
b) ( x –12):12=12
c) x -56 : 4= 16
d) 101 +(36 –4x) =105
e) 2(x-51) = 2.23+ 20
f) 10 -(x –3): 2 = 72–110
g) 2x –49 = 5.32h) [(8x -12) : 4].33= 36
i) 52x –3–2 . 52= 52. 3 k) (x3–7) : 4 = 5
a: 7x+58=100
nên 7x=42
hay x=6
c: x-56:x=16
nên x-14=16
hay x=30
c)x - 56 : 4 = 16
x - 56 = 16 : 4
x- 56 = 4
x =4 + 56
x = 60
d)101 + (36 - 4x) = 105
(36- 4x ) = 105 - 101
36 - 4x = 4
4x = 36 - 4
4x = 32
x = 32:4
x = 8
a) 58 + 7x = 100
7x = 100 - 58
7x = 42
x = 42 : 7
x = 6
b) (x - 12) : 12 = 12
x - 12 = 12 . 12
x - 12 = 144
x = 144 + 12
x = 156
bài 1 :tìm x,y biết
a) (5x+1)=\(\dfrac{36}{49}\) b) (x-2/9) = (2/3) c)(8x-1) 2x+1= 5^2 x+1
d) (x-3,5)^x+(y - 1/10)^4=0
`(5x+1)=36/49`
`<=> 5x = 36/49-1`
`<=> 5x = -13/49`.
`<=> x = -13/245.`
Vậy `x = -13/245`.
`b, x-2/9 = 2/3`.
`<=> x = 2/3 + 2/9`
`<=> x = 8/9`.
Vậy `x = 8/9`.
c: (8x-1)^(2x+1)=5^(2x+1)
=>8x-1=5
=>8x=6
=>x=3/4
d: Sửa đề: (x-3,5)^2+(y-1/10)^4=0
=>x-3,5=0 và y-0,1=0
=>x=3,5 và y=0,1
Tìm x, biết: [(8x -12) :4].3 =
Tìm x, biết:
b)\(5\sqrt{x-1}-\sqrt{36x-36}\)\(+\sqrt{9x-9}=\sqrt{8x+12}\)
Ta có: \(5\sqrt{x-1}-\sqrt{36x-36}+\sqrt{9x-9}=\sqrt{8x+12}\) \(\left(ĐK:x\ge1\right)\)
\(\Leftrightarrow5\sqrt{x-1}-6\sqrt{x-1}+3\sqrt{x-1}=\sqrt{8x+12}\)
\(\Leftrightarrow2\sqrt{x-1}=\sqrt{8x+12}\)
\(\Leftrightarrow\left(2\sqrt{x-1}\right)^2=\left(\sqrt{8x+12}\right)^2\)
\(\Leftrightarrow4.\left(x-1\right)=8x+12\)
\(\Leftrightarrow4x-4=8x+12\)
\(\Leftrightarrow-4x=16\)
\(\Leftrightarrow x=-4\left(L\right)\)
Vậy \(S=\varnothing\)
\(5\sqrt{x-1}-\sqrt{36\left(x-1\right)}+\sqrt{9\left(x-1\right)}=\sqrt{4\left(2x+3\right)}\)
\(5\sqrt{x-1}-6\sqrt{x-1}+3\sqrt{x-1}=2\sqrt{2x+3}\)
\(2\sqrt{x-1}=2\sqrt{2x+3}\)
\(\sqrt{x-1}=\sqrt{2x+3}\)
\(\hept{\begin{cases}2x+3\ge0\\x-1=2x-3\end{cases}}\)
\(\hept{\begin{cases}2x\ge-3\\x-2x=-3+1\end{cases}}\)
\(\hept{\begin{cases}x\ge-\frac{3}{2}\\-x=-2\end{cases}}\)
\(\hept{\begin{cases}x\ge-\frac{3}{2}\\x=2\end{cases}}\)
\(\Rightarrow x=2\)
Bạn FL.capheny bị sai dấu 2x+3 thành 2x-3 mà ai vẫn tk đúng vậy
1. Cho A = 1/4 x 3/6 x 5/8x.....x95/98x 97/100
2. Tìm một số biết nếu cộng thêm 20 vào 1/4 của nó thì bằng 36.