hỏi google phay

Hỏi gg đi khó lắm

\(a.2^6.\left(x-2\right)=104\)

\(x-2=104:2^6\)

\(x-2=1,652\)

\(x=1,625+2\)

\(x=3,625\)

\(b.2\times4^{x+1}=128\)

\(4^{x+1}=128:2\)

\(4^{x+1}=64\)

\(4^{x+1}=4^3\)

\(\Rightarrow x+1=3\)

\(x=3-1\)

\(\Leftrightarrow x=3\)

\(c.227-5\left(x+8\right)=3^6:3^3\)

\(227-5\left(x+8\right)=3^3\)

\(227-5\left(x+8\right)=27\)

\(5\left(x+8\right)=227-27\)

\(5\left(x+8\right)=200\)

\(x+8=200:5\)

\(x+8=40\)

\(x=40-8\)

\(x=32\)

ủng hộ mk nha, chắc đúng đó

cả tháng nay ms online lại

thx bn

a) \(\frac{3}{2}-\frac{5}{6}:x=\frac{5}{15}-\frac{3}{15}\)

\(\Leftrightarrow\frac{3}{2}-\frac{5}{6}:x=\frac{2}{15}\)

\(\Leftrightarrow\frac{5}{6}:x=\frac{3}{2}-\frac{2}{15}\)

\(\Leftrightarrow\frac{5}{6}:x=\frac{41}{30}\)

\(\Leftrightarrow x=\frac{5}{6}:\frac{41}{30}\)

\(\Leftrightarrow x=\frac{25}{41}\)

b) \(x-\frac{6}{7}.\frac{14}{8}=\frac{1}{2}-\frac{2}{5}\)

\(\Leftrightarrow x-\frac{3}{2}=\frac{1}{10}\)

\(\Leftrightarrow x=\frac{1}{10}+\frac{3}{2}\)

\(\Leftrightarrow x=\frac{8}{5}\)

c) \(x:\frac{6}{5}+\frac{2}{3}=\frac{7}{3}\)

\(\Leftrightarrow x:\frac{6}{5}=\frac{7}{3}-\frac{2}{3}\)

\(\Leftrightarrow x:\frac{6}{5}=\frac{5}{3}\)

\(\Leftrightarrow x=\frac{5}{3}.\frac{6}{5}\)

\(\Leftrightarrow x=2\)

huyền ngốc

Tìm \(x\):

a; \(x\) + 35,2 = [25,6 + 3,14] x 3

\(x+\) 35,2 = 28,74 x 3

\(x\) + 35,2 = 86,22

\(x\) = 86,22 - 35,2

\(x\) = 51,02

b; \(\frac{17}{5}\) : \(x\) = \(\frac{34}{5}\) : \(\frac43\)

\(\frac{17}{5}\) : \(x\) = \(\frac{34}{5}\) x \(\frac34\)

\(\frac{17}{5}\) : \(x\) = \(\) \(\frac{51}{10}\)

\(x\) = \(\frac{17}{5}\) : \(\frac{51}{10}\)

\(x\) = \(\frac{17}{5}\) x \(\frac{10}{51}\)

\(x\) = \(\frac23\)

c; [\(x\) - \(\frac12\)] x \(\frac53\) = \(\frac74\) - \(\frac12\)

[\(x\) - \(\frac12\)] x \(\frac53\) = \(\frac74-\frac24\)

[\(x-\frac12\)] x \(\frac53\) = \(\frac54\)

\(x-\frac12\) = \(\frac54\) : \(\frac53\)

\(x-\frac12\) = \(\frac54\) x \(\frac35\)

\(x\) - \(\frac12\) = \(\frac34\)

\(x=\frac34+\frac12\)

\(x=\frac34+\frac24\)

\(x=\) \(\frac54\)

d; [72 - 4 x \(x\)] : 9 = 4

72 - 4 x \(x\) = 4 x 9

72 - 4 x \(x\) = 36

4 x \(x\) = 72 - 36

4 x \(x\) = 36

\(x\) = 36 : 4

\(x\) = 9

Ta có:

(x:3-4).5=15

=> x:3-4=3

=>x:3=7

=>x=21

Vạy x=21

cậu giúp bài mới đăng đi

Số đó là:

     \(5+4=9.3=27:2=13,5\)

                                                 Đáp số: 13,5

x = (15 : 5 + 4) x 3

= (3 + 4) x 3

= 7 x 3

= 21.

Theo đề bài ra ta có:

( x : 3 – 4).5 = 15

x : 3 – 4 = 15 : 5

x : 3 – 4 = 3

x : 3 = 3 + 4

x : 3 = 7

x = 7.3

x = 21

Vậy x = 21

 bn tham khảo nhé Câu hỏi của nguyễn như tuyền - Toán lớp 6 - Học toán với OnlineMath 

k nha 

Ta có :

( x : 3 - 4 ) . 5 = 15

x : 3 - 4          = 3

x : 3               = 7

x                    = 21