Question

123 -5 . (x + 4) =38

(3.x - 16).343= 2. 2401

(2600 + 6400)-3 x =1200

6x - 72 : 2 - b4. 28= 5628

Answer 1

#)Giải :

\(123-5\left(x+4\right)=38\)

\(\Leftrightarrow5\left(x+4\right)=85\)

\(\Leftrightarrow x+4=17\)

\(\Leftrightarrow x=13\)

\(\left(3x-16\right)343=2.2401\)

\(\Leftrightarrow\left(3x-16\right)343=4802\)

\(\Leftrightarrow3x-16=14\)

\(\Leftrightarrow3x=30\)

\(\Leftrightarrow x=10\)

\(\left(2600+6400\right)-3x=1200\)

\(\Leftrightarrow9000-3x=1200\)

\(\Leftrightarrow3x=7800\)

\(\Leftrightarrow x=2600\)

P/s : Câu cuối cùng lỗi chỗ b4 ph k ? hay là tìm cả b và x thế ???

Answer 2

\(123-5\left(x+4\right)=38\)

\(=>123-5x-20=38\)

\(=>-5x=-123+20+38\)

\(=>-5x=-65\)

\(=>x=13\)

b, \(\left(3x-16\right)343=2.2401\)

=>1029x -5488= 4802

=> 1029x=5488+4802

=> 1029x= 10290

=> x=10

c, (2600+6400)-3x=1200

=> 9000-3x=1200

=> -3x= -9000+1200

=> -3x= -7800

=> x=2600

d,

k hiểu đề

Answer 3

xin lỗi b4 sữa lại 84 nha

Answer 4

6x-72:2-84.28=5628

=> 6x-36-2352= 5628

=> 6x= 36+2352+5628

=> 6x= 8016

=> x= 1336