Question

Tìm x biết:

a) 5x-16=40+x

b) -12+x=5x-20

c) 7x-4=20+3x

=>... THANKS TRƯỚC !!!

Answer 1

a) 5x - x = 40 + 16

4x = 56

x = 14

b) -12 + 20 = 5x - x

8 = 4x

x = 2

c) 7x - 3x = 20 + 4

4x = 24

x=6

Answer 2

a) 5x-16=40+x

<=> 4x = 56

<=> x = 14

b) -12+x=5x-20

<=> 4x = 8

<=> x = 2

c) 7x-4=20+3x

<=> 4x = 24

<=> x = 6

Answer 3

a) 5x-16=40+x

5x-x=40+16

4x=56

x=56:4

x=14

Vậy x=14.

b) -12+x=5x-20

x-5x=12-20

-4x=-8

x=(-8):(-4)

x=2

Vậy x=2.

c) 7x-4=20+3x

7x-3x=20+4

4x=24

x=24:4

x=6

Vậy x=6.

Answer 4

Trả lời:

\(a,\)\(5x-16=40+x\) 

\(\Leftrightarrow5x-x=40+16\)

\(\Leftrightarrow4x=56\)

\(\Leftrightarrow x=14\)

Vậy\(x=14\)

\(b,\)\(-12+x=5x-20\)

\(\Leftrightarrow5x-x=20-12\)

\(\Leftrightarrow4x=8\)

\(\Leftrightarrow x=2\)

Vậy\(x=2\)

\(c,\)\(7x-4=20+3x\)

\(\Leftrightarrow7x-3x=20+4\)

\(\Leftrightarrow4x=24\)

\(\Leftrightarrow x=6\)

Vậy\(x=6\)

Hok tốt!

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Answer 5

a , \(5x-16=40+x\)

\(\Leftrightarrow5x-x-16-40=0\)

\(\Leftrightarrow4x-56=0\)

\(\Leftrightarrow4x=56\)

\(\Leftrightarrow x=14\)

Answer 6

b , \(-12+x=5x-20\)

\(\Leftrightarrow-12+20+x-5x=0\)

\(\Leftrightarrow8-4x=0\)

\(\Leftrightarrow-4x=-8\)

\(\Leftrightarrow x=2\)

Answer 7

c , \(7x-4=20+3x\)

\(\Leftrightarrow7x-3x-4-20=0\)

\(\Leftrightarrow4x-24=0\)

\(\Leftrightarrow4x=24\)

\(\Leftrightarrow x=6\)