Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)x+2=-5
x=-5-2
x=-7
b)2x-30=14
2x=14+30
2x=44
x=44/2
x=22
c)14*23-4*23-4*(x+5)=30
(14-4)*23-4*(x+5)=30
10*23-4*(x+5)=30
230-4*(x+5)=30
4*(x+5)=230-30
4*(x+5)=200
x+5=200/4
x+5=50
x=50-5
x=45
d)3^x/3^5=45/5
3^x-5=9
3^x-5=3^2
x-5=2
x=2+5
x=7
2)x=2+2+0+1+0+2+0+1+1=9;y=9;z=9
a)x+2=-5
x=-5-2
x=-7
b)2x-30=-14
2x=-14+30
2x=16
x=16:2
x=8
c)14.23-4.23-4(x+5)=30
23(14-4)-4(x+5)=30
23.10-4(x+5)=30
230-4(x+5)=30
4(x+5)=230-30
4(x+5)=200
x+5=200:4
x+5=50
x=50-5
x=45
d)3x:35=45:5
3x:35=9
3x:35=32
x:5=2
x=2.5
x=10
2)z=3
câu a: x=-7
câu b:x=8
câu c:không có giá trị
câu d:x=7
\(14.23+4.23-4.\left(x+5\right)=30\)
<=>\(23\left(14+4\right)-4\left(x+5\right)=30\)
<=> \(23.18-4\left(x+5\right)=30\)
<=> \(414-4\left(x+5\right)=30\)
<=> \(-4\left(x+5\right)=-384\)
<=> \(x+5=96\)
<=> \(x=91\)
Vậy x= 91
\(x^6:x^3=125\)
\(x^3=125\)
\(x^3=5^3\)
\(\Rightarrow x=5\)
b, \(3.2^x-3=45\)
\(3.2^x=45+3\)
\(3.2^x=48\)
\(2^x=48:3\)
\(2^x=16\)
\(2^x=2^4\)
\(\Rightarrow x=4\)
c, \(1500:\left[\left(30+40\right):x\right]=30\)
\(1500:\left[70:x\right]=30\)
\(70:x=1500:30\)
\(70:x=50\)
\(x=70:50\)
\(x=\frac{70}{50}\)
\(x=\frac{7}{5}\)
d, \(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(720:\left[41-\left(2x-5\right)\right]=8.5\)
\(720:\left[41-\left(2x-5\right)\right]=40\)
\(41-\left(2x-5\right)=720:40\)
\(41-\left(2x-5\right)=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28:2\)
\(x=14\)
bạn thử lại nhé
Ta có x20=x1
=> x=0 hoặc x=1
x6:x3=x6-3=x3=125
=>x3=53
=> x=5
Ta có
4x3+12=120
=>4x3=108
=>x3=27
=>x=3
Ta có
3.2x-3=45
=>3(2x-1)=45
=>2x-1=15
=>2x=16
=> x=2 hoặc x=-2
Ta có 1500:[(30+40):x]=30
=>70:x=50
=> x=7/5
Ta có
720:[41-(2x-5)]=23.5
=>41-(2x-5)=720:40=18
=> 2x-5=23
=>x=(23+5):2=14
KL
a) (247 x 514 x 213 x 913 x 517 x 917 ) : (230 x 230 x 530 x 930)
(260 x 531 x 930) : (260 x 530 x 930) = 5
1) 2(3x + 5) - 6 = 0
2(3x + 5) = 6 + 0
2(3x + 5) = 6
3x + 5 = 6 : 2
3x + 5 = 3
3x = 5 - 3
3x = 2
x = 2 : 3
x = 2/3
2) 5x + 3(4 + 2x) = 25
11x + 12 = 25
11x = 25 - 12
11x = 13
x = 13 : 11
x = 13/11
3) 3(4x + 1) + 2(x - 1) = 105
14x + 1 = 105
14x = 105 - 1
14x = 104
x = 104 : 14
x = 104/14 = 52/7
4) 30 - [2(x - 3) - 2] = 14
[2(x - 3) - 2] = 30 - 14
[2(x - 3) - 2] = 16
2x - 8 = 16
2x = 16 + 8
2x = 24
x = 24 : 2
x = 12
5) 3(x - 8)(4x + 5) - 8(x - 8) = 0
12x2 - 89x - 56 = 0
x = 8 hoặc -7/12
6) 4x = 8
Vì: 41 = 4
42 = 16
=> x thuộc tập hợp rỗng
\(a,14-5+x=30\)
\(\Rightarrow9+x=30\Rightarrow x=30-9\)
\(\Rightarrow x=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14\)
\(\Rightarrow3+x=31\Rightarrow x=31-3\)
\(\Rightarrow x=28\)
\(c,18+\left(-3+x\right)-\left(44-x\right)=55\)
\(\Rightarrow18-3+x-44+x=55\)
\(\Rightarrow2x-29=55\Rightarrow2x=55+29\)
\(\Rightarrow2x=84\Rightarrow x=84:2\)
\(\Rightarrow x=42\)
\(d,\left(x-45\right).27=0\)
\(\Rightarrow x-45=0\Rightarrow x=45\)
x+2 = 5
x = 5-2
x = 3
2x - 30 = -14
2x = -14 +30
2x = 16
x= 16:2
x=8
14x23-4x23-4(x+5) = 30
322 - 92- 4(x+5) = 30
230 - 4(x+5) = 30
4(x+5) = 230 - 30
4(x+5) = 200
x+5 = 200 :4
x+5 = 50
x = 50 - 5
x = 45
3x :35 = 45:5
3x :35 = 9 = 32
3x :35 =32
=> 3x = 32 x 35
=>3x = 37
=> x = 7
x+2=5
=> x=5-2
=> x=3.
2x-30=-14
=> 2x=-14+30
=> 2x=16
=> x=16:2
=> x=8.
14.23-4.23-4.(x+5)=30
=> 23.(14-4)-4.(x+5)=30
=> 23.10-4.(x+5)=30
=> 230-4.(x+5)=30
=> 4.(x+5)=230-30
=> 4.(x+5)=200
=> x+5=200:4
=> x+5=50
=> x=50-5
=> x=45.
3x:35=45:5
=> 3x-5=9
=> 3x-5=32
=> x-5=2
=> x=2+5
=> x=7.