tìm y biết Yx142-41xY-Y=408000
yx142-41xy-y=408000
cảm ơn các bạn nhìu
\(\Leftrightarrow142\cdot y-41\cdot y-y=40800\)
\(\Leftrightarrow y\cdot\left(142-41-1\right)=40800\)
\(\Leftrightarrow y\cdot100=40800\)
\(\Leftrightarrow y=40800:100\)
\(\Leftrightarrow y=408\)
tìm y
a. y x 42 + y x 57 + y = 25400
b. 142 x y - 41 x y - y = 408000
a) y x 42 + y x 57 + y = 25 400
y x ( 42 + 57 + 1 ) = 25 400
y x 100 = 25 400
y = 25 400 : 100
y = 254
b) 142 x y - 41 x y - y = 408 000
y x ( 142 - 41 - 1 ) = 408 000
y x 100 = 408 000
y = 408 000 : 100
y = 4 080
a.y*(42+57+1)=25400
y*100=25400
y=25400:100=254
b.(142-41-1)*y=408000
100*y=408000
y=408000:100=4080
a. y x 42 + y x 57 + y = 25400
y = 25400 : (42 + 57 + 1)
y = 25400 : 100
y = 254.
b. 142 x y - 41 x y - y = 408000
y = 408000 : (142 - 41 - 1)
y = 408000 : 100
y = 4080.
tìm y
142x y -41 x y -y =408000
142 x y - 41 x y - y = 408000
=> 142 x y - 41 x y - 1 x y = 408000
=> ( 142 - 41 - 1 ) x y = 408000
=> 100 x y = 408000
=> y = 408000 : 100
=> y = 4080
= y = 408000 : 100
= 40800
d/s : 40800
Tìm x:
a. 1337 + 13 x x = 6745 b. 142 x x – 41 x x – x = 408000
\(a,1337+13\times x=6745\\ \Rightarrow13\times x=6745-1337\\ \Rightarrow x=5408:13\\ \Rightarrow x=416\\ b,142\times x-41\times x-x=408000\\ \Rightarrow x\times\left(142-41-1\right)=408000\\ \Rightarrow x\times100=408000\\ \Rightarrow x=408000:100\\ \Rightarrow x=4080\)
a. 1337 + 13 x x = 6745
13 x x = 6745-1337
13 x x = 5408
x = 5408 : 13
x = 416
b. 142 x x – 41 x x – x = 408000
142 x x – 41 x x – x x 1 = 408000
(142-41-1) x x = 408 000
100 x x = 408000
x = 408 000:100
x = 4080
Giaỉ hệ phương trình
1) \(\left\{{}\begin{matrix}x^2-2xy+x+y=0\\x^4-x^2\left(4y-3\right)+y^2=0\end{matrix}\right.\)
2)\(\left\{{}\begin{matrix}3x^2+2xy+y^2=11\\x^2+2xy+3y^2=17\end{matrix}\right.\)
3)\(\left\{{}\begin{matrix}x^3-2y^3-x-4y=0\\13x^2-41xy+21y^2+9=0\end{matrix}\right.\)
tính giá trị của phân thức M = \(\dfrac{5x-4y}{5x+4y}\) biết rằng 25x^2 + 16y^2 = 41xy và 4y<5x<0
Ta có : M\(^2\)= (\(\dfrac{5x-4y}{5x+4y}\))\(^2\) = \(\dfrac{\left(5x-4y\right)^2}{\left(5x+4y\right)^2}\)= \(\dfrac{25x^2+16y^2-40xy}{25x^2+16y^2+40xy}\)
= \(\dfrac{41xy-40xy}{41xy+40xy}=\dfrac{xy}{81xy}=\dfrac{1}{81}=\left(\dfrac{1}{9}\right)^2\)
Mà 4y < 5x < 0 \(\Rightarrow\)5x - 4y > 0 . 5x +4y < 0 \(\Rightarrow\) M < 0
Vậy M = - \(\dfrac{1}{9}\)
tinh m=(5x-4y)/(5x+4y) biet 25x^2 +16y^2=41xy va4y<5x<0
tinh m=(5x-4y)/(5x+4y) biet 25x^2+16y^2=41xy va4y<5x<0
Tính giá trị biểu thức\(M=\frac{5x-4y}{5x+4y}\)
Biết\(\hept{\begin{cases}26x^2+16y^2=41xy\\4y< 5x< 0\end{cases}}\)