\(4^x+4^{x+3}=4160\)

\(\Leftrightarrow4^x.\left(1+4^3\right)=4160\)

\(\Leftrightarrow4^x.65=4160\)

\(\Leftrightarrow4^x=4160:65=64\)

\(\Rightarrow x=3\)

\(\dfrac{4-x}{-5}=\dfrac{-5}{4-x}\)
\(\Leftrightarrow\left(4-x\right)\left(4-x\right)=-5\times-5\)
\(\Rightarrow\left(4-x\right)^2=25\)
\(\Rightarrow\left[{}\begin{matrix}4-x=5\\4-x=-5\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-1\\x=9\end{matrix}\right.\)

\(\dfrac{4-x}{-5}=\dfrac{-5}{4-x}\)

\(\Rightarrow\left(4-x\right).\left(4-x\right)=\left(-5\right).\left(-5\right)\)

\(\Rightarrow\left(4-x\right)^2=25\)

\(\Rightarrow\left(4-x\right)^2=5^2\)

\(\Rightarrow4-x=\pm5\)

\(\Rightarrow\left[{}\begin{matrix}4-x=5\\4-x=-5\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=4-5\\x=4-\left(-5\right)\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=-1\\x=9\end{matrix}\right.\)

=>(4-x)^2=25

=>(x-4)^2=25

=>x-4=5 hoặc x-4=-5

=>x=-1 hoặc x=9

4(x-12)-2=50

4(x-12)=50+2

4(x-12)=52

x-12=52÷4

x-12=13

x=25

4(x-12)-2=50

4(x-12)=50+2

4(x-12)=52

x-12=52÷4

x-12=13

x=25

x=9,16515139?

4 /x=y/21=28/49

vì 21.4/12=7 nên x=7

    28.21/49 =12 nên y=12 (công thức nhân chéo)

vậy ,x=7 ;y=12

4 – (27 – 3) = x – (13 – 4)

4 – 27 + 3 = x – 13 + 4 (bỏ ngoặc)

4 – 27 + 3 + 13 – 4 = x (chuyển vế –13 và 4)

–27 + 16 = x

–11 = x.

Vậy x = –11.

4-27-3=x-13-4.  
=>-x=-4+27+3-13-4.  
=>-x=9.  
=>x=-9
 

\(4-27-3=x-13-4\Rightarrow-26=x-17\Rightarrow x=-6\)

ủa câu nào đúng vậy các bạn

4-(27-3)=x-(13-4)

=>-20=x-9

=>x=-20+9

=>x=-11

4-27+3=x-13+4

-20=x-13+4

x-13+4=-20

x-13=-20-4

x-13=-24

x=-24+13

x=-11

 4 - (27-3) = x - (13-4)

=.x=-11

x-9=4-24

x=-20+9

x=-11

x=1234567............... 1 TRONG CÁC SỐ ĐÓ

-11 nhé

4-(27-3)=x-(13-4)

-20=x-(13-4)

-20=x-9

x=-20+9

x=-11

4-[27-3]=x-[13-4]

4-24=x-9

x-9=4-24

x-9=(-20)

   x=(-20)+9

    x=(-11)

TICK MÌNH VÀI CÁI CHO TRÒN 80 VỚI NHA CÁC BẠN

x=-11 ban oi....tick cho mjh nhe

4 - 24 = x - 9

- 20 = x - 9

x - 9 = - 20

x = (-20) + (+9)

x = -11