1) Tinh dao ham:
y = x3(1-x)2
Cho ham so y = F(x) = 3x-1
a)Tinh f(0),f(-1)
b)Tinh gia tri tuong ung cua x voi y =2,-4
cho ham so y=f(x)=-2x+3 .Tinh f(-2);f(-1);f(0);f(-1/2);f(1/2)
f(-2)=(-2)*(-2)+3=4+3=7
f(-1)=(-2)*(-1)+3=2+3=5
f(0)=-2*0+3=0+3=3
f(-1/2)=-2*(-1/2)+3=1+3=4
f(1/2)=-2*(1/2)+3=-1+3=2
Vậy f(-2)=7; f(-1)=5; f(0)=3; f(-1/2)=4; f(1/2)=2
1/ Tính đạo hàm:
\(y=\left|x-1\right|\left(x\ne1\right)\)
bang 2 cach
2/ Dao ham:
\(y=\sqrt{\dfrac{1}{2}+\dfrac{1}{2}\sqrt{\dfrac{1}{2}+\dfrac{1}{2}\sqrt{\dfrac{1}{2}+\dfrac{1}{2}\cos x}}}\left(x\in0;\pi\right)\)
1.
Cách 1: Tính bằng công thức
\(\left\{\begin{matrix} y=x-1(x>1)\\ y=1-x(x<1)\end{matrix}\right.\Rightarrow \left\{\begin{matrix} y'=1(x>1)\\ y'=-1(x<1)\end{matrix}\right.\)
Tóm gọn lại: $y'=\frac{|x-1|}{x-1}$
Cách 2: Tính bằng định nghĩa.
\(y'=\lim\limits_{x\to 1}\frac{|x-1|-0}{x-1}=\frac{|x-1|}{x-1}\)
2. Với $x\in (0;\pi)$ thì:
\(y=\sqrt{\frac{1}{2}+\frac{1}{2}\sqrt{\frac{1}{2}+\frac{1}{2}\sqrt{\frac{\cos x+1}{2}}}}=\sqrt{\frac{1}{2}+\frac{1}{2}\sqrt{\frac{1}{2}+\frac{1}{2}\sqrt{\cos ^2\frac{x}{2}}}}\)
\(=\sqrt{\frac{1}{2}+\frac{1}{2}\sqrt{\frac{1}{2}+\frac{1}{2}\cos \frac{x}{2}}}=\sqrt{\frac{1}{2}+\frac{1}{2}\sqrt{\cos ^2\frac{x}{4}}}=\sqrt{\frac{1}{2}+\frac{1}{2}\cos \frac{x}{4}}=\sqrt{\cos ^2\frac{x}{8}}=\cos \frac{x}{8}\)
\(\Rightarrow y'=-\frac{1}{8}\sin \frac{x}{8}\)
Cho ham so y=f(x) =3x - 8
a)Tinh f(3) ; f(-2)
b)Tinh x khi biet gia tri tuong ung y la 1
Lời giải:
a)
\(f(3)=3.3-8=1\)
\(f(-2)=3(-2)-8=-14\)
b)
\(y=f(x)=3x-8=1\)
\(\Leftrightarrow 3x=9\Leftrightarrow x=3\)
cho ham so y=f(x)=4x^2-5.a,tinh f(3).f(-1/2) b,tim x de f(x)=-1
\(a,\)
\(y=f\left(3\right)=4.3^2-5=31\)
\(y=f\left(-\frac{1}{2}\right)=4.\left(-\frac{1}{2}\right)^2-5=-4\)
\(b,\)
\(y=f\left(x\right)=4x^2-5\)
\(\Leftrightarrow4.x^2-5=-1\)
\(\Leftrightarrow4.x^2=4\)
\(\Leftrightarrow x^2=1\)
\(\Leftrightarrow x=1\)
y=ƒ (3)=4.3²−5=31
y=ƒ (−1/2 )=4.(−1/2 )2−5=−4
b,
y=ƒ (x)=4x2−5
⇔4.x2−5=−1
⇔4.x²=4
⇔x²=1
⇔x=1
chúc bn học tốt
cho ham so y=\(\dfrac{3}{2}\)x =f(x)
a)tinh f(-1);f(2);f(-4)
b)ve do thi ham so tren
f(-1) = \(\dfrac{3}{2}.-1=-\dfrac{3}{2}\)
f(-2) = \(\dfrac{3}{2}.2=3\)
f(-4) = \(\dfrac{3}{2}.-4=-6\)
ch ham so y=f(x)=|x-1|+2
a,tinh f(-2); f(1/2)
b,tim x sao cho f(x)=3
a, Ta có: f(-2) = |-2 - 1| + 2 = |-3| + 2 = 5
f(1/2) = |1/2 - 1| + 2 = |-0,5| + 2 =2,5
b, Ta có: f(x) = 3 =>|x - 1| + 2 = 3 => |x - 1| = 3 - 2 => |x - 1| = 1
=> x - 1 = 1 hoặc x - 1 = -1
=> x = 2 hoặc x = 0
Cho ham so y=f(x)=2x
a)Tinh f(-2);f(2)
b)Ve do thi ham so y=2x
c)Cac diem sau diem nao nam tren do thi cua ham so A(2;4), B(-3;6), C(-1 phan 2;1)
\(f\left(x\right)=2x.\)
a) Thay \(x=-2\) vào \(f\left(x\right)\) ta được:
\(f\left(-2\right)=2.\left(-2\right)\)
\(f\left(-2\right)=-4.\)
+ Thay \(x=2\) vào \(f\left(x\right)\) ta được:
\(f\left(2\right)=2.2\)
\(f\left(2\right)=4.\)
Chúc bạn học tốt!
đặt y=f(x)=2x
ta có:
f(-2)=2.(-2)=-4
f(2)=2.2=4
mình ko vẽ hình nhé
cho ham so y=f<x>=3x{1}
A,ve do thi ham so {1}
B,tinh f(0);f(-1/3)
cho hai ham so y = f(x) = 2x - \(^{x^2}\) ; y = g(x) = x - 7 + 3 . tinh f(1) va g(2)
y = f(x) = 2x - x2
f(1) = 2.1 - 12 = 2 - 1 = 1
y = g(x) = x - 7 + 3
g(2) = 2 - 7 + 3 = -2