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1) 15:(x+2) = 3
x + 2 = 15 : 3
x + 2 = 5
x = 5 - 2
x = 3
2) 20:(1+x) = 2
1 + x = 20 : 2
1 + x = 10
x = 10 - 1
x = 9
3) 5(x+35) = 515
x + 35 = 515 : 5
x + 35 = 103
x = 103 - 35
x = 68
4) 541+(218-x) = 73
218 - x = 73 - 541
218 - x = -468
x = 218 - ( - 468 )
x = 686
5) 1230:3 (x-20) = 10
410 . ( x - 20 ) = 10
x - 20 = 10 : 410
x - 20 = 1/41
x = 1/41 + 20
x = 821/41
6) 48-3(x+5) = 24
3( x + 5 ) = 48 - 24
3( x + 5 ) = 24
x + 5 = 24 : 3
x + 5 = 8
x = 8 - 5
x = 3
7) 4x + 18 : 2=13
4x + 9 = 13
4x = 13 - 9
4x = 4
x = 1
8) X-48:16 = 37
x - 3 = 37
x = 37 + 3
x = 40
a, 15: (x+2) = 3
x+2 =15:3
x+2 = 5
x = 5-2
x = 3
b, 20: (1+x) = 2
1+x = 20:2
1+x = 10
x = 10-1
x = 9
c, 5(x+35) = 515
x+35 = 515 :5
x+35 = 103
x = 103-35
x = 68
d, 541+ (218-x) = 73
218-x = 73-541
218-x = - 468
x = 218 - (-468)
x = 218 + 468
x = 686
e, 1230:3. (x-20) = 10
410(x-20) = 10
x-20 = 10: 410
x-20 = 1/41
x = 1/41 + 20
x = 821/41
f, 48-3(x+5) = 24
3(x+5) = 48-24
3(x+5) = 24
x+5 = 24:3
x +5 = 8
x = 8-5
x =3
g, 4x + 18 : 2 = 13
4x + 9 = 13
4x = 13-9
4x = 4
x = 4:4
x = 1
j, x - 48:16 = 37
x- 3 = 37
x = 37+3
x = 40
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
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 \(x=155\)
48-3(x+5)=24 1230:3(x-20)=10
3(x+5)=48-24 3(x-20)=1203:10
3(x+5)=24 3(x-20)= 120,3
x+5=24:3 x-20=120,3:3
x+5=8 x-20=40,1
x=8-5 x=40,1+20
x=3 x=60,1
mk nghĩ thế
\(48-3\left(x+5\right)=24\)
\(-3\left(x+5\right)=48-24\)
\(-3x-15=24\)
\(-3x=24+15\)
\(-3x=39\)
\(x=-13\in N\)
\(1230:3\left(x-20\right)=10\)
\(410\left(x-20\right)=10\)
\(x-20=\frac{10}{410}\)
\(x-20=\frac{1}{41}\)
\(x=\frac{1}{41}+20\)
\(x=\frac{821}{41}\in N\)
a) 5(x + 35) = 515
x + 35 = 515 : 5
x + 35 = 103
x = 103 - 35
x = 68
b) 12x - 33 = 32.33
12x - 33 = 35
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
c) 541 + (218 - x) = 73
218 - x = 73 - 541
218 - x = -468
-x = -468 - 218
-x = -686
x = 686
d) 1230 : 3(x - 20) = 10
410(x - 20) = 10
x - 20 = 10 : 410
x - 20 = 1/41
x = 1/41 + 20
x = 821/41
5(x+ 35 ) = 515
x + 35 = 103
x = 68
12x - 33 = 32 . 33
12x = 276
x = 23
541 + ( 218 - x ) = 73
218 - x = - 468
x = - 250
1230 : 3( x - 20 ) = 10
=> 3x - 60 = 123
=> 3x = 183
=> x = 61
Study well
Ta có : \(x=3210+5\left(\dfrac{1230}{3}.2-\dfrac{220}{5}\right)=3210+5.776=3210+3880=7090\)
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