Question

timf x thuộc N biết

a/ 321 + 2(x -4) = 2017

b/ 48 - 3(x +5) =24

c/1230 : 3(x-20) = 10

d/2x - 238 = 2^3 x 3^2

Answer 1

a/ 321 + 2(x -4) = 2017

2(x -4) =1696

x-4=848

x=852

b/ 48 - 3(x +5) =24

3(x +5)=24

x+5=8

x=3

c/1230 : 3(x-20) = 10

3(x-20)=123

x-20=41

x=61

d/2x - 238 = 2^3 x 3^2

2x - 238 =72

2x=200

x=100

Answer 2

a) \(321+2\left(x-4\right)=2017\)

\(2x-8=2017-321\)

\(2x-8=1696\)

\(2x=1704\)

\(x=852\)

vay \(x=852\)

b) \(48-3\left(x+5\right)=24\)

\(3x+15=48-24\)

\(3x+15=24\)

\(3x=9\)

\(x=3\)

vay \(x=3\)

c) \(1230:3\left(x-20\right)=10\)

\(3x-60=1230:10\)

\(3x-60=123\)

\(3x=183\)

\(x=61\)

vay \(x=61\)

d) \(2x-238=2^3.3^2\)

\(2x-238=8.9\)

\(2x-238=72\)

\(2x=310\)

\(x=155\)

vay \(x=155\)