\(\left(2y+1\right)^3=-125\)
\(\Rightarrow\left(2y+1\right)^3=\left(-5\right)^3\)
\(\Rightarrow2y+1=-5\)
\(\Rightarrow2y=-5-1\)
\(\Rightarrow2y=-6\)
\(\Rightarrow y=-3\)
chúc học tốt
Ta có : (2y+1)3 = -125
(-5)3 = -125
=> 2y+1 = -5
2y =(- 5) - 1
2y = (-5) + (-1)
2y = -6
y = (-6) : 2
y = -3
k mik nha các bạn!^_^
(2y+1)3= -125
=>2y+1= -5
=>2y= -5-1=-6
=>y= -6:2= -3
Nhớ k nha
8y3 + 1 = -125
8y3 = -126
y3 = -126 : 8
y3 = -15,75
y = - \(\sqrt[3]{15,75}\)
Ta có:\(\left(2y+1\right)^3=\left(-5\right)^3\)
\(\Rightarrow2y+1=-5\)
\(\Rightarrow y=\frac{-5-1}{2}=\frac{-6}{2}=-3\)