a, 1230 : 3(x – 20) = 10

3(x – 20) = 123

x – 20 = 41

x = 61

b, 250 – 10.(24 – 3x):15 = 244

10.(24 – 3x):15 = 6

10.(24 – 3x) = 90

24 – 3x = 9

3x = 15

x = 5

c,  4 x 3  + 15 = 47

4 x 3 = 32

x 3 = 8 = 2 3

x = 2

d,  65 - 4 x + 2 = 2014 0

65 - 4 x + 2 = 1

4 x + 2 = 64 = 4 3

x + 2 = 3

x = 1

e,  4 . 2 x - 3 = 125

4 . 2 x = 128

2 x = 32 = 2 5

x = 5

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

\(48-3\left(x+5\right)=24\)

\(-3\left(x+5\right)=48-24\)

\(-3x-15=24\)

\(-3x=24+15\)

\(-3x=39\)

\(x=-13\in N\)

\(1230:3\left(x-20\right)=10\)

\(410\left(x-20\right)=10\)

\(x-20=\frac{10}{410}\)

\(x-20=\frac{1}{41}\)

\(x=\frac{1}{41}+20\)

\(x=\frac{821}{41}\in N\)

ko bt có sai sót ko? ^ - ^ <k cho mik nhé>

48-3(x+5)=24
3(x+5)=48-24
(x+5)=24:3
x+5= 8
x=8-5
x=3

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 

a) \(5\left(x+35\right)=515\)

          \(\left(x+35\right)=515:5\)

            \(x+35=103\)

                       \(x=103-35\)

                        \(x=68\)

            Vậy \(x=68\)

b) \(12x.-33=3^2.3^3\)

\(12x.-33=9.27\)

\(12x.-33=243\)

\(12.x=243+33\)

\(12.x=276\)

        \(x=276:12\)

         \(x=23\)

Vậy \(x=23\)

c) \(541+\left(218-x\right)=73\)

                       \(\left(218-x\right)=73-541\)

                          \(218-x=-468\)

                                         \(x=218-\left(-468\right)\)

                                          \(x=218+468\)

                                            \(x=686\)

                                Vậy \(x=686\)

d) \(1230:3\left(x-20\right)=10\)

                   \(3.\left(x-20\right)=1230:10\)

                  \(3.\left(x-20\right)=123\)

                         \(\left(x-20\right)=123:3\)

                           \(x-20=41\)

                                    \(x=41+20\)

                                   \(x=61\)

                            Vậy \(x=61\)

Chúc bạn học tốt !!!

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 \(x=155\)

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

Tính nhanh:

\(10+20+30+40+50+60+70+80+90+100\)

\(=\left(10+90\right)+\left(20+80\right)+\left(30+70\right)+\left(60+40\right)+50+100\)

\(=100+100+100+100+150\)

\(=550\)

Tính:

40 + 1 230 = 1 270

1 230 + 40 = 1 270

67 478 + 9 076 = 76 554

9 076 + 67 478 = 76 554

Tính nhanh:

10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90 + 100

= (10 + 90) + (20 + 80) + (30 + 70) + (40 + 60) + (100 + 50)

= 100 + 100 + 100 + 100 + 150

= 100 \(\times\) 4 + 150

= 400 + 150

= 550

X=61

K nha

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