Question

a/\(\frac{8-11x}{4}=13\)
b/\(\frac{3x-4 }{7}=2\)
c/\(\frac{2x-5}{7}=\frac{5-2x}{5}\)
 

Answer 1

c/ \(\frac{2x-5}{7}=\frac{5-2x}{5}\)

=> 5 (2x - 5) = 7 (5 - 2x)

=> 10x - 25 = 35 - 14x

=> 10x + 14x = 35 + 25

=> 24x = 60

=> x = 2,5

Answer 2

a)-4

b)6

c)5/2

Answer 3

\(a)\) \(\frac{8-11x}{4}=13\)

\(\Leftrightarrow\)\(8-11x=13.4\)

\(\Leftrightarrow\)\(8-11x=52\)

\(\Leftrightarrow\)\(11x=8-52\)

\(\Leftrightarrow\)\(11x=-44\)

\(\Leftrightarrow\)\(x=\frac{-44}{11}\)

\(\Leftrightarrow\)\(-4\)

Vậy \(x=-4\)

Answer 4

chưa ai làm câu thứ 2 sao :))

b) \(\frac{3x-4}{7}=2\)

\(\Leftrightarrow\)\(3x-4=2.7\)

\(\Leftrightarrow\)\(3x-4=14\)

\(\Leftrightarrow\)\(3x=18\Leftrightarrow x=\frac{18}{3}=6\)

Nhân chéo tích lên là được nhé 

Answer 5

\(a\frac{8-11x}{4}=13\)

\(\Leftrightarrow8-11x=52\)

\(\Leftrightarrow-11x=44\)

\(\Leftrightarrow x=-4\)

\(b.\frac{3x-4}{7}=2\)

\(3x-4=14\)

\(\Leftrightarrow3x=18\)

\(\Leftrightarrow x=6\)

c.\(\frac{2x-5}{7}=\frac{5-2x}{5}\)

\(\Leftrightarrow5\left(2x-5\right)=7\left(5-2x\right)\)

\(\Leftrightarrow10x-25=35-14x\)

\(\Leftrightarrow10x+14x=25+35\)

\(\Leftrightarrow24x=60\)

\(\Leftrightarrow x=2,5\)

Answer 6

xl mik chưa kết luận nghiệm

\(a.\)vậy\(S=\left\{-4\right\}\)

B.Vậy \(S=\left\{6\right\}\)

c.vậy \(S=\left\{2,5\right\}\)