![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(450:\left(x-19\right)=15\)
\(=>x-19=450:15=30\)
\(=>x=30+19=49\)
\(\left(x-1\right)\left(y-2\right)=2=1.2=-1.-2\)
\(x-1=1=>x=2\)
\(y-2=1=>y=3\)
\(x-1=2=>x=3\)
\(y-2=2=>y=4\)
\(x-1=-1=>x=0\)
\(y-2=-1=>y=1\)
\(x-1=-2=>x=-1\)
\(y-2=-2=>y=0\)
Câu C làm tương tự câu b
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(252=2^2.3.31\)
\(858=2.3.11.13\)
\(156=2^2.3.13\)
\(ƯCLN\left(252,858,156\right)=2.3=6\)
b, Vì : 400 chia cho x thì dư 40
\(\Rightarrow400-40⋮x\left(x>40\right)\)
\(\Rightarrow360⋮x\) (1)
Vì : 450 chia cho x thì dư 18
\(\Rightarrow450-18⋮x\left(x>18\right)\)
\(\Rightarrow432⋮x\) (1)
Từ (1) và (2) \(\Rightarrow x\inƯC\left(360,432\right)\left(x>40\right)\)
\(360=2^3.3^2.5\)
\(432=2^4.3^2\)
\(ƯCLN\left(360,432\right)=2^3.3^2=72\)
\(\RightarrowƯC\left(360,432\right)=Ư\left(72\right)=\left\{1;2;3;4;6;8;9;12;18;24;36;72\right\}\)
Mà : \(x>40\Rightarrow x=72\)
Vậy x = 72
![](https://rs.olm.vn/images/avt/0.png?1311)
\(450:\left(x-19\right)=50\\ \Leftrightarrow x-19=5\\ \Leftrightarrow x=24\)
\(2\left(x-52\right)=2.23+20\\ \Leftrightarrow2\left(x-52\right)=66\\ \Leftrightarrow x-52=33\\ \Leftrightarrow x=85\)
\(10-\left(x-3\right):2=72-100\\ \Leftrightarrow10-\left(x-3\right):2=-28\\ \Leftrightarrow10-\left(x-3\right)=-56\\ \Leftrightarrow x-3=66\\ \Leftrightarrow x=69\)
1.x-19=450:50
x-19=9
x =9+19
x =28
2. 2(x-51)=46+20
2(x-51)=66
x-51=66:2
x-51=33
x =33+51
x =84
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\Leftrightarrow x+9=39\Leftrightarrow x=30\\ b,\Leftrightarrow73-x=69\Leftrightarrow x=4\\ c,\Leftrightarrow x+7=38\Leftrightarrow x=31\\ d,\Leftrightarrow x+4=178\Leftrightarrow x=174\\ e,\Leftrightarrow2\left(x-51\right)=16+20=36\Leftrightarrow x-51=18\Leftrightarrow x=69\\ f,\Leftrightarrow x-19=9\Leftrightarrow x=28\\ g,\Leftrightarrow4\left(x-3\right)=49-1=48\Leftrightarrow x-3=12\Leftrightarrow x=15\)
a) 45 - ( x + 9 ) = 6
45 - x = 6 + 9
45 - x = 15
x = 45 - 15
x = 30
b) 89 - ( 73 - x ) = 20
89 - x = 20 + 73
89 - x = 93
x = 93 - 89
x = 4
c) 198 - ( x + 4 ) = 120
198 - x = 120 + 4
198 - x = 124
x = 198 - 124
x = 74
d) ( x + 7 ) - 25 = 13
x - 25 = 13 + 7
x - 25 = 20
x = 20 + 25
x = 45
e) 2 ( x - 51 ) = 2.23 + 20
2 ( x - 51 ) = 64 + 20
2 ( x - 51 ) = 84
x - 51 = 84 - 2
x - 51 = 82
x = 82 + 51
x = 133
f) 450 : ( x - 19 ) = 50
450 : x = 50 - 19
450 : x = 41
x = 450 : 41
x = 24
![](https://rs.olm.vn/images/avt/0.png?1311)
a/\(450:\left(x-19\right)=50\)
=>\(x-19=9\)
=>\(x=28\)
Vậy...
b/\(3^2.\left(x+4\right)-5^2=5x.2^2\)
\(9\left(x+4\right)=20x+25\)
\(20x+25=9x-36\)
\(11x=-61\)
\(x=-\dfrac{61}{11}\)
Vậy..
c/Tương tự
d/Tương tự
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 576 : x - 30 = 2
576 : x = 2 + 30
576 : x = 32
x = 576 : 32
x = 18
b) 180 - ( x - 45 ) : 2 = 120
( x - 45 ) : 2 = 180 - 120
( x - 45 ) : 2 = 60
x - 45 = 60 * 2
x - 45 = 120
x = 120 + 45
x = 165
a﴿ 576 : x ‐ 30 = 2
576 : x = 2 + 30
576 : x = 32
x = 576 : 32
x = 18
b﴿ 180 ‐ ﴾ x ‐ 45 ﴿ : 2 = 120
﴾ x ‐ 45 ﴿ : 2 = 180 ‐ 120
﴾ x ‐ 45 ﴿ : 2 = 60
x ‐ 45 = 60 * 2
x ‐ 45 = 120
x = 120 + 45
x = 165
![](https://rs.olm.vn/images/avt/0.png?1311)
x : ( 2400 : 30 ) = 560 : 280
x : 80 = 2
x = 2 * 80 => x = 160 (câu a)
a, x: [2400:30] = 560 : 280
x : 80 = 2
x = 160
b,225 : x = 390 : 130
225 : x = 3
x=75
bai nay de thui
nhung bay gio mk phai di hoc rui
luc nao ve mk lam cho
k mk nha
\(\frac{450}{2^X-19}=180\)
\(2^X-19=\frac{450}{180}\)
\(2^X-19=2,5\)
\(2^X=19+2,5\)
\(2^X=21,5\)