
2x+1 | 1 | 3 |
y-2 | 3 | 1 |
x | 0 | 1 |
y | 5 | 3 |
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
2x+1 | 1 | 3 |
y-2 | 3 | 1 |
x | 0 | 1 |
y | 5 | 3 |
\(b,\left(2x+1\right).\left(39-2\right)=-55\)
\(\Rightarrow\left(2x+1\right).37=-55\)
\(\Rightarrow3x+1=-\frac{55}{37}\)
\(\Rightarrow3x=-\frac{92}{37}\)
\(\Rightarrow x=-\frac{92}{111}\)
\(c,\left(x-7\right)\left(x+3\right)< 0\)
\(\Rightarrow\orbr{\begin{cases}x-7>0;x+3< 0\\x-7< 0;x+3>0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x>7;x< -3\\x< 7;x>-3\end{cases}}\)
a> (x+3).(y+2)=1
x+3=1 va y+2=1
x=-2 y=-1
Zay x=-2 va y=-1
b>(2x-5).(y-6)=17
=>2x-5=17 hoac y-6=17
2x=22 y=17+6
x=22/2 y=23
Zay x=22 va y=23
Chuc ban may man trong cuoc song !!!!! ^_^
a/ Ta có: (x + 3)(y + 2) = 1 = 1.1 = (-1).(-1)
Vậy (x;y) = (-2;-1) = (-4;-3)
b/ (2x - 5).(y - 6) = 17 = 1.17 = 17.1 = (-1).(-17) = (-17).(-1)
Vậy (x;y) = (-2;23) = (6;7) = (-3;-11) = (-11;5)
Trả lời:
\(2x-138=2^3.3^2\)
\(2x-138=8.9\)
\(2x-138=72\)
\(2x\) \(=\)\(138+72\)
\(2x\) \(=\)\(210\)
\(x\) \(=\)\(210:2\)
\(x\) \(=\)\(105\)
2x - 138=2^3.3^2
2x-138=8.9
2x-138=72
2x=138+72
2x=210
x=210:2
x=105
a) \(x+xy-y=8\)
\(\Leftrightarrow x.\left(1+y\right)-y=8\)
\(\Leftrightarrow x.\left(1+y\right)-y-1=8-1\)
\(\Leftrightarrow x.\left(1+y\right)-\left(1+y\right)=7\)
\(\Leftrightarrow\left(1+y\right).\left(x-1\right)=7\)
Lập bảng tìm tiếp
b) Ta có: \(\hept{\begin{cases}\left(x+2\right)^2\ge0\forall x\\\left(2y-6\right)^4\ge0\forall x\end{cases}}\)
\(\Rightarrow\left(x+2\right)^2+\left(2y-6\right)^4\ge0\forall x\)
Do đó \(\left(x+2\right)^2+\left(2y-6\right)^4=0\)
\(\Leftrightarrow\hept{\begin{cases}\left(x+2\right)^2=0\\\left(2y-6\right)^4=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=-2\\y=3\end{cases}}}\)
Vậy ...