X -13 =-2
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\(a,\left(x-2\right)\cdot13=0\\ \Rightarrow x-2=0\\ \Rightarrow x=2\)
Vậy x = 2
\(b,\left(x-2\right)\cdot13=13\\ \Rightarrow x-2=1\\ \Rightarrow x=3\)
Vậy x = 3
\(c,\left(x-2\right):13=1\\ \Rightarrow x-2=13\\ \Rightarrow x=15\)
Vậy x = 15
\(d,13:\left(x-2\right)=1\\ \Rightarrow x-2=13\\ \Rightarrow x=15\)
Vậy x = 15
\(e,13:\left(x-2\right)=13\\ \Rightarrow x-2=1\\ \Rightarrow x=3\)
Vậy x = 3
a,(x−2)⋅13=0⇒x−2=0⇒x=2a,(x−2)⋅13=0⇒x−2=0⇒x=2
Vậy x = 2
b,(x−2)⋅13=13⇒x−2=1⇒x=3b,(x−2)⋅13=13⇒x−2=1⇒x=3
Vậy x = 3
c,(x−2):13=1⇒x−2=13⇒x=15c,(x−2):13=1⇒x−2=13⇒x=15
Vậy x = 15
d,13:(x−2)=1⇒x−2=13⇒x=15d,13:(x−2)=1⇒x−2=13⇒x=15
Vậy x = 15
e,13:(x−2)=13⇒x−2=1⇒x=3e,13:(x−2)=13⇒x−2=1⇒x=3
Vậy x = 3
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1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
![](https://rs.olm.vn/images/avt/0.png?1311)
`1, -2/9 xx 15/17 + (-2/9) xx 2/17`
`= -2/9 xx (15/17 + 2/17)`
`= -2/9 xx 17/17`
`=-2/9xx1`
`=-2/9`
__
`-5/3 xx 6/5 + (-7/9) xx 3/10`
`= -30/15 + (-21/90)`
`= -2 + (-7/30)`
`=-60/30 +(-7/30)`
`=-67/30`
__
`15/20 xx 7/5 + (-9/7) xx (-6/4)`
`=3/4 xx7/5 + (-9/7) xx(-6/4)`
`= 21/20 + 54/28`
`= 21/20 + 27/14`
`=417/140`
__
`-25/13 xx 5/19 + (-25/13) xx 14/19`
`=-25/13 xx (5/19 +14/19)`
`=-25/13 xx 19/19`
`= -25/13 xx 1`
`=-25/13`
__
`-7/13 xx 13/5 + (-9/7) xx 5/3`
`=-7/5 +(-15/7)`
`=-124/35`
![](https://rs.olm.vn/images/avt/0.png?1311)
1 ) f ( x ) = 1 3 + 2 x + 1 3 + 2 x = 1 3 + 2 x + 2 x 3 . 2 x + 1 = 4 x + 6 . 2 x + 1 3 . 4 x + 10 . 2 x + 3
⇒ f ' ( x ) = 2 . 4 x . ln 2 + 5 . 2 x . ln 2 3 . 4 x + 10 . 2 x + 3 3 . 4 x + 10 . 2 x + 3 2
- 6 . 4 x . ln 2 + 10 . 2 x . ln 2 4 x + 6 . 2 x + 1 3 . 4 x + 10 . 2 x + 3 2
= 2 . 2 x + 6 3 . 4 x + 10 . 2 x + 3 - 6 . 2 x + 10 4 x + 6 . 2 x + 1 3 . 4 x + 10 . 2 x + 3 2 . 2 x . ln 2 = - 8 . 4 x + 8 3 . 4 x + 10 . 2 x + 3 2 . 2 x . ln 2
f ' ( x ) = 0 ⇔ - 8 . 4 x + 8 = 0 ⇔ 4 x = 1 ⇔ x = 0
2 ) f ( x ) = 4 x + 6 . 2 x + 1 3 . 4 x + 10 . 2 x + 3
Ta có
f ( x ) - 1 3 = 4 x + 6 . 2 x + 1 3 . 4 x + 10 . 2 x + 3 - 1 = - 2 . 4 x - 4 . 2 x - 2 3 . 4 x + 10 . 2 x + 3 < 0 , ∀ x ⇒ f ( 1 ) + f ( 2 ) + . . + f ( 2017 ) < 1 + 1 + . . . + 1 = 2017 ⇒ f ( 1 ) + f ( 2 ) + . . + f ( 2017 = 2017 ⇒ 2 ) s a i
3) f ( x 2 ) = 1 3 + 2 x + 1 3 + 2 - x ⇒ f ( x 2 ) = 1 3 + 4 x + 1 3 + 4 - x l à s a i
Chọn đáp án A.
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\(\Rightarrow\frac{x+2}{10^{10}}+\frac{x+2}{11^{11}}-\frac{x+2}{12^{12}}-\frac{x+2}{13^{13}}=0\)
\(\Rightarrow\left(x+2\right)\left(\frac{1}{10^{10}}+\frac{1}{11^{11}}-\frac{1}{12^{12}}-\frac{1}{13^{13}}\right)=0\)
Vì \(\frac{1}{10^{10}}+\frac{1}{11^{11}}-\frac{1}{12^{12}}-\frac{1}{13^{13}}\ne0\)
=>x+2=0
=>x=-2
Vậy x=-2
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x-13=-2
x=-2+13
x=11
Chúc bạn học giỏi
Tk cho mình nha
x-13=-2=x=-2+13=11
chúc bạn hoc giỏi