Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) \(\frac{3}{4}+\frac{2}{5}x=\frac{29}{60}\)
\(\frac{2}{5}x=\frac{29}{60}-\frac{3}{4}\)
\(\frac{2}{5}x=\frac{-4}{15}\)
\(x=\frac{-4}{15}:\frac{2}{5}\)
\(x=\frac{-2}{3}\)
b) \(x^4=16\)
\(x^4=2^4\)
\(x=2\)
c) \(\left(x+5\right)^3=-64\)
\(\left(x+5\right)^3=-4^3\)
\(x+5=-4\)
\(x=-4-5\)
\(x=-9\)
d) \(\left(x-\frac{3}{4}\right)^2=0\)
\(\left(x-\frac{3}{4}\right)^2=0^2\)
\(x-\frac{3}{4}=0\)
\(x=0+\frac{3}{4}\)
\(x=\frac{3}{4}\)
e) \(x:8,5=0,69:\left(-1,15\right)\)
\(x:8,5=-0,6\)
\(x=-0,6.8,5\)
\(x=-5,1\)
A.2/5x=29/60-3/4
2/5x=29/60-45/60
2/5x=-4/15
x=-4/15:2/5
x=4/15.5/2
x=-2/3
B. x mũ 4 = 42
-) x=2
C. (x+5) mũ 3 = -4 3
x+5 = -4
X= -4-5
X=-9
D. ( X -3/4)mũ 2=0 mũ 2
X= 0+3/4
X=3/4
E. X:8,5=-0,6
X=-0,6*8,5
X=5,1
Bài 2:
a: \(\Leftrightarrow x=\dfrac{29}{60}\cdot\dfrac{-7}{5}=\dfrac{-203}{300}\)
b: \(\Leftrightarrow x\cdot\dfrac{2}{5}=\dfrac{29}{60}-\dfrac{3}{4}=\dfrac{29-45}{60}=\dfrac{-16}{60}=\dfrac{-8}{30}\)
\(\Leftrightarrow x=\dfrac{-8}{30}:\dfrac{2}{5}=\dfrac{-8\cdot5}{30\cdot2}=\dfrac{-40}{60}=-\dfrac{2}{3}\)
a) 3/4 + 1/4 : x = 2/5
1/4 : x = 2/5 - 3/4 = 8/20 - 15/20
1/4 : x = -7/20
x = 1/4 : -7/20 = 1/4 . -20/7
x = -5/7
b) 3/4 + 2/5 . x = 29/60
2/5 . x = 29/60 - 3/4 = 29/60 - 45/60
2/5 . x = -4/15
x= -4/15 : 2/ 5 = -4/5 . 5/2
x = -2/3
Answer:
Đặt \(A\left(x\right)=0\)
\(\Rightarrow\frac{2}{3}x^3+\frac{3}{4}x^2+\frac{4}{5}x-2\frac{13}{60}=0\)
\(\Rightarrow60\left(\frac{2}{3}x^3+\frac{3}{4}x^2+\frac{4}{5}x-\frac{133}{60}\right)=0.60\)
\(\Rightarrow40x^3+45x^2+48x-133=0\)
\(\Rightarrow40x^3+\left(85x^2-40x^2\right)+\left(133x-85x\right)-133=0\)
\(\Rightarrow\left(40x^3+85x^2+133x\right)-\left(40x^2+85x+133\right)=0\)
\(\Rightarrow x\left(40x^2+85x+133\right)-\left(40x^2+85x+133\right)=0\)
\(\Rightarrow\left(x-1\right)\left(40x+85x+133\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-1=0\\40x^2+85x+133=0\end{cases}\Rightarrow\orbr{\begin{cases}x=1\\x\in\varnothing\end{cases}}}\)
34+25x=2960⇒25x=2960−34⇒25x=2960−3.1560⇒25x=29−4560⇒25x=−1660=−415⇒x=−415:25⇒x=−415.52⇒x=−23Vậyx=−23
\(\frac{3^2.3^8}{27^3}=3x=>\frac{3^{10}}{\left(3^3\right)^3}=3x=>\frac{3^{10}}{3^9}=3x=>3^{10-9}=3x=>3x=3=>x=1\)
`3/4+2/5x=29/60`
`2/5x=29/60-3/4`
`2/5x=-4/15`
`x=-4/15:2/5`
`x=-2/3`