tim y:1,1\(\times\)1,2\(\times\)1,3\(\times\)y=y\(\times\)2,1\(\times\)2,2\(\times\)2,3
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) \(6,5+1,2+3,5-5,2+6,5-4,8\)
\(=6,5+1,2+3,5+6,5-5,2-4,8\)
\(=\left(6,5+3,5+6,5\right)+1,2-\left(5,2+4,8\right)\)
\(=16,5+1,2-10\)
\(=17,7-10\)
\(=7,7.\)
b) \(\left(-4,3.1,1+1,1.4,5\right):\left(-0,5:0,05+10,01\right)\)
\(=\left\{1,1.\left[\left(-4,3\right)+4,5\right]\right\}:\left[\left(-10\right)+10,01\right]\)
\(=\left(1,1.0,2\right):0,01\)
\(=0,22:0,01\)
\(=22.\)
c) \(\left(6,7+5,66-3,7+4,34\right).\left(-76,6.1,2+7,66.12\right)\)
\(=\left[\left(5,66+4,34\right)+\left(6,7-3,7\right)\right].\left[7,66.\left(-10\right).1,2+7,66.12\right]\)
\(=\left[10+3\right].\left[7,66.\left(-12\right)+7,66.12\right]\)
\(=13.\left\{7,66.\left[\left(-12\right)+12\right]\right\}\)
\(=13.0\)
\(=0.\)
Chúc bạn học tốt!
a) 3y + 2y = 850
5y = 850
y = 850 : 5
y = 170
Ps: Ko nên tự trả lời ,tự !
Ta có: \(1,2\left(\dfrac{2,4y-0,23}{y}-0,05\right)=1,44\)
\(\Rightarrow\dfrac{2,4y-0,23}{y}-0,05=1,2\)
\(\Rightarrow\dfrac{2,4y-0,23}{y}=1,25\)
\(\Rightarrow2,4y-0,23=1,25y\)
\(\Rightarrow2,4y-1,25y=0,23\)
\(\Rightarrow1,15y=0,23\)
\(\Rightarrow y=0,2=\dfrac{1}{5}\)
Vậy \(y=\dfrac{1}{5}.\)
\(1,2.\left(\dfrac{2,4y-0,23}{y}-0,05\right)=1,44\)
\(\Rightarrow\dfrac{2,4y-0,23}{y}-0,05=1,2\)
\(\Rightarrow\dfrac{2,4y-0,23}{y}=1,25\)
\(\Rightarrow2,4y-0,23=1,25y\)
\(\Rightarrow2,4y-1,25y=0,23\)
\(\Rightarrow1,15y=0,23\)
\(\Rightarrow y=\dfrac{0,23}{1,15}=0,2\)
Vậy y = 0,2
\(\left(x^2.y\right)^5.\left(x^2.y^2\right)^7.\left(x.y^2\right)^6.x^3\)
\(=x^{10}.y^5.x^{14}.y^{14}.x^6.y^{12}.x^3\)
\(=x^{33}.y^{31}\)
xy + 2x - y = 5
=> x(y + 2) - y - 2 = 3
=> x(y + 2) - (y + 2) = 3
=> (x - 1)(y + 2) = 3
x-1 | 1 | -1 | 3 | -3 |
y+2 | 3 | -3 | 1 | -1 |
x | 2 | 0 | 4 | -2 |
y | 1 | -5 | -1 | -3 |
\(xy+2x-y=5\)
\(\Leftrightarrow x\left(y+2\right)-\left(y+2\right)=3\)
\(\Leftrightarrow\left(y+2\right)\left(x-1\right)=3\)
\(\Leftrightarrow y+2;x-1\inƯ\left(3\right)=\left\{-3;-1;1;3\right\}\)
Ta có bảng
x-1 | -3 | -1 | 1 | 3 |
x | -2 | 0 | 2 | 4 |
y+2 | -1 | -3 | 3 | 1 |
y | -3 | -5 | 1 | -1 |