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VN
1
NH
14 tháng 4 2019
\(2x\left(3y-2\right)+\left(3y-2\right)=-55\)
\(\left(3y-2\right)\left(2x+1\right)=-55=1.\left(-55\right)=\left(-1\right).55=\left(-5\right).11=5.\left(-11\right)\)
| 3y - 2 | 1 | -1 | -5 | 5 |
| y | 1 | 1/3 (L) | -1 | 7/3 (L) |
| 2x + 1 | -55 | 55 | 11 | -11 |
| x | -28 | 27 | 5 | -6 |
Vậy \(\left(y,x\right)=\left\{\left(1;-28\right),\left(-1;5\right)\right\}\)
HN
0
N
9 tháng 12 2016
x(y+2)+3y =6
=>x(y+3)+3y+9=15
=>x(y+3)+3(y+3)=15
=>(x+3)(y+3)=15
mả .....=......=>ta co bang sau
4 tháng 11
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NT
2
14 tháng 1 2019
\(xy-3x-3y=2\)
\(\Rightarrow x\left(y-3\right)-3y=2\)
\(\Rightarrow x\left(y-3\right)-3y+9=2+9\)
\(\Rightarrow x\left(y-3\right)-3\left(y-3\right)=11\)
\(\Rightarrow\left(y-3\right)\left(x-3\right)=11\)
\(+,\hept{\begin{cases}y-3=1\\x-3=11\end{cases}\Rightarrow\hept{\begin{cases}y=4\\x=14\end{cases}}}\) \(+,\hept{\begin{cases}y-3=-1\\x-3=-11\end{cases}\Rightarrow\hept{\begin{cases}y=2\\x=-8\end{cases}}}\)
\(+,\hept{\begin{cases}y-3=11\\x-3=1\end{cases}\Rightarrow\hept{\begin{cases}y=14\\x=4\end{cases}}}\) \(+,\hept{\begin{cases}y-3=-11\\x-3=-1\end{cases}\Rightarrow\hept{\begin{cases}y=-8\\x=2\end{cases}}}\)
HT
13 tháng 7 2015
Bài 1:
a,x + ( x + 1) + (x + 2) + (x + 3) +....+ (x + 30) = 1240
x + x +x +.... + x + (1 + 2+ 3+ ....+ 30) = 1240
31x + 465 =1240
31x = 1240 - 465
31x = 775
x = 775 : 31
x = 25
b, Đề sai, bạn xem lại đề nhé.
13 tháng 7 2015
bài 1 câu b
1+2+3+...+x=40
\(\frac{x.\left(x+1\right)}{2}\)=40
x.(x+1)=40.2
x.(x+1)=80
x.(x+1)=?
cậu viết đề sai thì phải
13 tháng 10 2020
cau 1 phan h thanh nhan tu roi chia truong hop giai
cau 2 an may tinh cho nhanh
cau 3 4 bo ngoac roi tim x nhu binh thuong la xong