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) 54 + ( 218 - x ) = 735

218 - x = 735 - 34

218 - x = 701

        x = 218 - 701

        x = -483

b) 96 - 3 ( x + 1 ) = 42

3 ( x + 1 ) = 96 - 42

3 ( x + 1 ) = 54

x + 1 = 54 : 3

x + 1 = 18

      x = 18 - 1

      x = 17

c) 5 ( x + 35 ) 515

x + 35 = 515 : 5

x + 35 = 103

       x  = 103 - 35

       x  = 68

d) 12x - 33 = 3² . 3²

12x - 33 = 9.9

12x - 33 = 81

12x = 81 + 33

12x = 114

    x = 114 : 12

    x = 9,5

a) 54+(218-x)=735

          218-x=681

                x=-463

b) 96-3(x+1)=42

         3(x+1)=54

           x+1=18

           x=17

c) 5(x+35)=515

      x+35=103

       x=68

d) 12x-33=3^2.2^2

     12x-33=81

      12x = 114

          x=9,5

Nhấn đúng cho mk nha!!!!!!!!

ồ

dễ nhỉ

thế cũng hỏi sao

k mk nha

k mk mk k lại

a) 541 + (218 - x) = 735

\(\Rightarrow\) 218 - x = 735 - 541

\(\Rightarrow\) 218 - x = 194.

\(\Rightarrow\) x = 218 - 194

\(\Rightarrow\) x = 24

b) 5(x + 35) = 515

\(\Rightarrow\) x + 35 = 515 : 5 = 103.

\(\Rightarrow\) x = 103 - 35

\(\Rightarrow\) x =68.

c) 96 - 3(x + 1) = 42

\(\Rightarrow\) 3(x + 1) = 96 - 42 = 54

\(\Rightarrow\) x + 1 = 54 : 3

\(\Rightarrow\) x = 18 - 1

\(\Rightarrow\) x = 17

d) 12x - 33 = 3² . 3³

\(\Rightarrow\) 12x - 33 = 243

\(\Rightarrow\)12x = 243 + 33

\(\Rightarrow\) 12x = 276.

\(\Rightarrow\) x = 23.

a) 541 + (218 - x) = 735

Suy ra 218 - x = 735 - 541 hay 218 - x = 194.

Do đó x = 218 - 194. Vậy x = 24.

b) 5(x + 35) = 515 suy ra x + 35 = 515 : 5 = 103.

Do đó x = 103 - 35 =68.

c) Từ 96 - 3(x + 1) = 42 suy ra 3(x + 1) = 96 - 42 = 54. Do đó x + 1 = 54 : 3 = 18. Vậy x = 18 - 1 hay x = 17.

d) Từ 12x - 33 = 3² . 3³ hay 12x - 33 = 243 suy ra 12x = 243 + 33 hay 12x = 276. Vậy x = 23.

\(a,2.\left(x+15\right)-5=35\)

\(\Leftrightarrow2.\left(x+15\right)=35+5\)

\(\Leftrightarrow2.\left(x+15\right)=40\)

\(\Leftrightarrow x+15=40:2\)

\(\Leftrightarrow x+15=20\)

\(\Leftrightarrow x=20-15\)

\(\Leftrightarrow x=5\) \(\text{Vậy }x=5\)

\(b,9x-33=3^{2015}:3^{2014}\)

\(\Leftrightarrow9x-33=3^{2015-2014}\)

\(\Leftrightarrow9x-33=3\)

\(\Leftrightarrow9x=3+33\)

\(\Leftrightarrow9x=36\)

\(\Leftrightarrow x=36:9\)

\(\Leftrightarrow x=4\) \(\text{Vậy }x=4\)

\(c,3.\left(2x-4\right)^3=24\)

\(\Leftrightarrow\left(2x-4\right)^3=24:3\)

\(\Leftrightarrow\left(2x-4\right)^3=8\)

\(\Leftrightarrow\left(2x-4\right)^3=2^3\)

\(\Leftrightarrow2x-4=2\)

\(\Leftrightarrow2x=2+4\)

\(\Leftrightarrow2x=6\)

\(\Leftrightarrow x=6:2\)

\(\Leftrightarrow x=3\) \(\text{Vậy }x=3\)

\(d,\left(x-140\right):7=3\)

\(\Leftrightarrow\left(x-140\right)=3.7\)

\(\Leftrightarrow x-140=21\)

\(\Leftrightarrow x=21+140\)

\(\Leftrightarrow x=161\) \(\text{Vậy }x=161\)

\(e,2.3^x-5^3:5^5=29\)

\(\Leftrightarrow2.3^x-5^3:5^3:5^2=29\)

\(\Leftrightarrow2.3^x-1:5^2=29\)

\(\Leftrightarrow2.3^x-\frac{1}{25}=29\)

\(\Leftrightarrow2.3^x=29+\frac{1}{25}\)

\(\Leftrightarrow2.3^x=\frac{726}{25}\)

\(\Leftrightarrow3^x=\frac{726}{25}:2\)

\(\Leftrightarrow3^x=\frac{726}{25}:2\)

\(\Leftrightarrow3^x=\frac{363}{25}\)

\(\Leftrightarrow3^x=3^{2,435369636...}\)

\(\Leftrightarrow x=2,435369636...\)

\(\text{Vậy }x=2,435369636\left(\text{bạn thử kiểm tra lại đề nha}\right)\)

\(f,12:x\text{ và }x\le5\)

\(\text{Do }x\le5\)

\(\Leftrightarrow12:x\le2,4\left(\text{lấy 12 chia cho cả 2 vế}\right)\)

\(\text{Câu này bạn phải cho điều kiện }x\in N,\text{nếu không x có nhiều giá trị lắm }\)

\(\text{Nếu }x\in N\Rightarrow12:x\in N\)

\(\Leftrightarrow12:x\le2,4\left(\text{lấy 12 chia cho cả 2 vế}\right)\)

\(\Rightarrow12:x\in\left\{0;1;2\right\}\)

\(\begin{matrix}12:x&0&1&2\\x&x\in\varnothing&12&6\\\text{Đánh giá}&Loại&Chọn&Chọn\end{matrix}\)

\(\text{Vậy }x\in\left\{6;12\right\}\)

\(g,3x-2x+7x=16\)

\(\Leftrightarrow x.\left(3-2+7\right)=16\)

\(\Leftrightarrow x.8=16\)

\(\Leftrightarrow x=16:8\)

\(\Leftrightarrow x=2\) \(\text{Vậy }x=2\)

\(h,5^{10}.\left(2x-1\right)=5^{12}\)

\(\Leftrightarrow2x-1=5^{12}:5^{10}\)

\(\Leftrightarrow2x-1=5^2\)

\(\Leftrightarrow2x-1=25\)

\(\Leftrightarrow2x=25+1\)

\(\Leftrightarrow2x=26\)

\(\Leftrightarrow x=26:2\)

\(\Leftrightarrow x=13\) \(\text{Vậy }x=13\)

\(i,5⋮\left(x+1\right)\)

\(\Rightarrow x+1\inƯ\left(5\right)=\left\{-1;1;-5;5\right\}\)

\(\text{Vậy }x\in\left\{-6;-2;0;4\right\}\)

DẤU CHẤM LÀ NHÂN NHA

12.x-33=3^2.3^3

=>12x-33=3⁵

=>12x-33=243

=>12x=243+33

=>12x=276 <=> x=23

\(12.x-33=3^2.3^3\)

\(12x-33=3^5=243\)

\(12x=243+33\)

\(12x=276\)

\(x=276:12\)

\(x=23\)

\(5^{10}:5^8+x=3^{20}:\left(-3\right)^{18}-2^{35}:\left(-2\right)^{33}\\ \Leftrightarrow5^2+x=3^2+\left(-2\right)^2\\ \Leftrightarrow25+x=13\\ \Leftrightarrow x=-12\)

5^10/5^8+x=3^20/(-3)^18-2^35/(-2)^33

5^2+x=(-3)^2+2^2

25+x= 9+4

25+x=13

      x=13-25

     x=-12

vậy x=-12

cac ban sai roi

x= (4^2-10)/2=3

x=(3^5+33)/12=23

a) 10 + 2x = 4⁵ : 4³                                                        

      10 + 2x = 4^{5 - 3}

       10 + 2x = 4²

       10 + 2x = 16

               2x = 16 - 10

               2x  = 6

                  x  = 6 : 2

                  x  = 3 

b) 12x - 33 = 3² . 3³

      12x - 33 = 3²⁺³

       12x - 33 = 3⁵

       12x - 33 = 243

      12x         = 243+33

      12x         = 276

           x         = 276 : 12

           x         = 23