Để phân số này âm \(\Leftrightarrow x-2< 0\\ \Leftrightarrow x< 2\)

kết hợp \(x>0\)

\(\Rightarrow0< x< 2\)

\(\Rightarrow x=\left\{1\right\}\)

\(=\frac{\left(x+1\right)\left(x+2\right)\left(x-5\right)\left(x+5\right)}{\left(x+2\right)\left(x+5\right)}=\left(x+1\right)\left(x-5\right)=x^2-4x-5\)

là

13/27=9/27+3/27+1/27=1/3+1/9+1/27

Bike : I go to school by bike

 I often go to school by bike

They cry because thay must be apart

She blows the ballons

My favourate í blue 

The light is shining

He tidies his room

I'm have a new bike.

The baby is crying.

I'm blowing the balloon.

The sky is blue.

The ball is ver light.

My room is very clean.

lại nước rút tiếp nè huhu an ủi mình đi các bn

em mới lớp 5

Cách 1 :

Ta có : \(1-\frac{4}{11}=\frac{7}{11};1-\frac{8}{15}=\frac{7}{15}\)

Vì \(\frac{7}{11}>\frac{7}{15}\)nên \(\frac{4}{11}< \frac{8}{15}\).

Cách 2 :

Vì \(\frac{4}{11}< \frac{4}{8}=\frac{1}{2};\frac{1}{2}=\frac{8}{16}< \frac{8}{15}\)nên \(\frac{4}{11}< \frac{8}{15}\).

~ HOK TỐT ~

Cách 1:

  \(1-\frac{4}{11}=\frac{7}{11}\)

\(1-\frac{8}{15}=\frac{7}{15}\)

Vì \(\frac{7}{11}>\frac{7}{15}\Rightarrow\frac{4}{11}< \frac{8}{15}\)

Cách 2:

     \(\frac{4}{11}=\frac{60}{165}\)

      \(\frac{8}{15}=\frac{88}{165}\)

Vì \(\frac{60}{165}< \frac{88}{165}\)

\(\Rightarrow\frac{4}{11}< \frac{8}{15}\)

Cách 3:

    Ta có:

 \(\frac{4}{11}=\frac{8}{22}< \frac{8}{15}\)

\(\Rightarrow\frac{4}{11}< \frac{8}{15}\)

      Cách 4:

\(\frac{4}{11}-1=\frac{-7}{11}\)

\(\frac{8}{15}-1=\frac{-7}{15}\)

Vì \(\frac{-7}{11}< \frac{-7}{15}\)\(\Rightarrow\frac{4}{11}< \frac{8}{15}\)

=45/46

1/1x2 + 2/2x4 + 3/4x7 + 4/7x11 +...+ 8/29x37 + 9/37x46 

=2-1/1x2+4-2/2x4+...+46-37/37x46

=1-1/2+1/2-1/4+...+1/37-1/46

=1-1/46

=45/46

`#``\text{Lócc}`

`***` chấm là nhân.

\(\dfrac{1}{1.2}+\dfrac{2}{2.4}+\dfrac{3}{4.7}+\dfrac{4}{7.11}+...+\dfrac{8}{29.37}+\dfrac{9}{37.46}\\ =\dfrac{1}{1}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{11}+..+\dfrac{1}{29}-\dfrac{1}{37}+\dfrac{1}{37}-\dfrac{1}{46}\\ =\dfrac{1}{1}-\dfrac{1}{46}\\ =\dfrac{46}{46}-\dfrac{1}{46}\\ =\dfrac{45}{46}\)

C

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