Câu 6: Khôg có cau nào đúng

Câu 7: C

Câu 8: B

Câu 9: B

Câu 10: D

6Không có đáp án nào đúng x=11/4

7C

8B

9B

10D

a) x+3/22=-27/121.11/9

⇒ x+3/22=-3/11

⇒ x=-9/22

b) (3/2/20-2/1/20)x+2/7=3/5

⇒ (31/10-41/20)x=11/35

⇒ 21/20x=11/35

⇒x=44/147

c) |3/2x-5|-1/2=-1/4

⇒ |3/2x-5|=1/4

⇒ hoặc 3/2x-5=1/4⇒3/2x=21/4⇒x=7/2

hoặc 3/2x-5=-1/4⇒3/2x=19/4⇒x=19/6

x^2=16

Suy ra x^2=4^2

Vậy x^2=4^2

[1/(x+2)-1/(x+5)]+[1/(x+5)-1/(x+10)]+[1/(x+10)-1/(x+17)]=x/15.[1/(x+2)-1/(x+17)]
1/(x+2)-1/(x+17)=x/15.[1/(x+2)-1/(x+17)]
1=x/15
x=15

sdsdxc

=>(4-x:2)^3=1+2*(8-5)+1

=>(4-x:2)^3=2+2*3=8

=>4-x:2=2

=>x:2=2

=>x=4

tk:

\(=>(4-x:2)^3=1+2*(8-5)+1\)

\(=>(4-x:2)^3=2+2*3=8\)

\(=>4-x:2=2\)

\(=>x:2=2\)

\(=>x=4\)

a) \(\frac{x+4}{20}=\frac{5}{x+4}\Leftrightarrow\left(x+4\right)^2=100\Rightarrow x+4=+-10\Leftrightarrow x=-4+-10\)

b) \(\frac{x-1}{x+2}=\frac{x-2}{x+3}\Leftrightarrow\left(x-1\right)\left(x+3\right)=\left(x+2\right)\left(x-2\right)\Leftrightarrow x^2+2x-3=x^2-4\Leftrightarrow2x=-1\Leftrightarrow x=-\frac{1}{2}\)

a)\(\frac{x+4}{20}=\frac{5}{x+4}\)

<=>(x+4)²=20.5

<=>(x+4)²-100=0

<=>(x+4-10)(x+4+10)=0

<=>(x-6)(x+14)=0

<=>x-6=0 hoặc x+14=0

<=>x=6 hoặc x=-14

b)\(\frac{x-1}{x+2}=\frac{x-2}{x+3}\)

<=>(x-1)(x+3)=(x-2)(x+2)

<=>x²+2x-3=x²-4

<=>x²+2x-3-x²+4=0

<=>2x+1=0

<=>2x=-1

<=>x=-1/2

-2.(x-5)-18=20-3.(x+4)

<=> -2x+10-18=20-3x-12

<=>-2x-8=8-3x

<=>-2x+3x=8+8

<=>x=16

Vậy x=16

Học tốt!!!

#Bo_lienminhmeovatrau

tìm x biết

-2.(x-5)-18=20-3.(x+4)

-2x+10-18=20-3x-12

-2x+3x=20-12-10+18

        x=16

Vậy x=16

-2(x-5)-18=20-3(x+4)

<=> -2x+10-18=20-3x-12

<=> -2x-8=-3x+8

<=> -2x-8+3x-8=0

<=> x-16=0

<=> x=16

 720 : ( x . 2 + x . 3 ) = 3.2
720 : ( x . 2 + x.3 ) = 6
( x .2 + x.3 )           = 720 : 6 
x.2+x.3 = 120
x . ( 2 + 3 ) = 120
x . 5 = 120
     x     = 120 : 5 
    x      = 24