x, y cùng dấu

=> /x/+/y/=/x+y/=> x+y=+-10

okok

\(\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\left(0,5-1\dfrac{3}{5}\right)\)

\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\left(\dfrac{1}{2}-\dfrac{8}{5}\right)\)

\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\dfrac{11}{10}\)

\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{33}{80}\)

\(\Rightarrow x:2,2=\dfrac{33}{80}:\dfrac{1}{6}\)

\(\Rightarrow x:2,2=\dfrac{99}{40}\)

\(\Rightarrow x=\dfrac{99}{40}\times2,2\)

\(\Rightarrow x=\dfrac{1089}{200}\)

=>(x:2,2)*1/6=-3/8(1/2-8/5)=33/80

=>x:2,2=99/40

=>x=1089/200

=>3^x(1+3^2)=3^34+3^36

=>3^x.10=3^34.10

=>3^x=3^34

=>x=34

b: \(\sqrt{8^2+6^2}-\sqrt{16}+\dfrac{1}{2}\sqrt{\dfrac{4}{25}}\)

\(=10-4+\dfrac{1}{2}\cdot\dfrac{2}{5}=6+\dfrac{1}{5}=\dfrac{31}{5}\)

4:

a: căn x-1=3

=>căn x=4

=>x=16

b: căn x-3=2

=>căn x=5

=>x=25

c: 5/12*căn x-1/6=1/3

=>5/12*căn x=1/2

=>căn x=1/2:5/12=1/2*12/5=12/10=6/5

=>x=36/25

d: căn x-1-3=0

=>căn x-1=3

=>x-1=9

=>x=10

e: =>căn x+1=1

=>x+1=1

=>x=0

f: =>|3/5*căn x-1/20|=1/5+3/4=19/20

=>3/5*căn x-1/20=-19/20 hoặc 3/5*căn x-1/20=19/20

=>3/5*căn x=1

=>căn x=5/3

=>x=25/9

120 dm² x 5 + 4m² = 600 dm² +  4 m² = 6 m² + 4m² = 10 m²

Bạn tham khảo  bài này xong tự làm nha : 

So sánh 2³⁰¹và 3²⁰¹

Ta có : 2³⁰¹=2²⁰⁰.2=(2³)¹⁰⁰.2=8¹⁰⁰.2

          :3²⁰¹=3²⁰⁰.3= ( 3²)¹⁰⁰=9¹⁰⁰.3

Do 8<9=>8¹⁰⁰<9¹⁰⁰  :2<3 => 8¹⁰⁰.2<9¹⁰⁰.3=>2³⁰¹<3²⁰¹

\(x+\frac{2}{15}=\frac{1}{3}\)

\(x=\frac{1}{3}-\frac{2}{15}\)

\(x=\frac{1}{5}\)

h, \(h,\frac{1}{3}-\frac{2}{3}:x=\frac{1}{4}\)

\(\frac{2}{3}:x\)= \(\frac{1}{3}-\frac{1}{4}\)

\(\frac{2}{3}:x=\frac{1}{12}\)

\(x=\frac{2}{3}:\frac{1}{12}\)

\(x=8\)

Mình đang cần gấp 

\(\left(126+32\right)\times\left(18-16-2\right)\\ =\left(126+32\right)\times0\\ =0\)

(126+32)×(18−16−2)
=(126+32)×0
=0