=x*10-(1+2+3+4+......+10)=145

=x*10-55=145

=x*10=145+45

x*10=200

x=200/10

x=20

b,2.(1+2+3+4+.......+x)=420

1+2+3+4+.....+x=420/2

1+2+3+4+.....+x=210

ta co: 20.21=420

suy ra x=20

t i c k nha ban

a. 100 + x = 987

x = 987 – 100

x = 887

b. 204 – x = 18 : 6

204 – x = 3

x = 204 – 3

x = 201

c. x × 5 = 450 – 420

x × 5 = 30

x = 30 : 5

x = 6

\(12.\left(x+41\right)=624\)

\(\Leftrightarrow x+41=52\)

\(\Leftrightarrow x=11\)

\(420:\left(3x-6\right)=7\)

\(\Leftrightarrow3x-6=60\)

\(\Leftrightarrow3x=66\)

\(\Leftrightarrow x=22\)

12 . ( x + 41 ) = 624 

x + 41 = 624 : 12

x + 41 = 52

x         = 52 - 41 

x         =   11

420 : ( 3 . x-6 ) = 7

3 . x - 6 = 420 : 7

3 . x - 6  =   60

3 . x  = 60 + 6 

3 . x = 66

x  = 66 : 3

x  =   22

12.(X+41)=624

     (X+41)=624:12

      X       = 52-41

      X       = 11

420:(3.X-6)=7

       (3.X-6)=420:7

        3.X-6 = 60

        3.X    = 60-6

        3.X    = 54

           X    = 54:3

           X    = 18

a)\(2.x-138=8.9\)

\(2.x-138=72\)

\(2.x=72+138\)

\(2.x=210\)

\(x=210\div2\)

\(x=105\)

b)\(\left\{\left(6x-72\right)\div2-84\right\}.28=5628\)

\(\left(6x-72\right)\div2-84=201\)

\(\left(6x-72\right)\div2=285\)

\(6x-72=570\)

\(6x=642\)

\(x=107\)

c)\(420+65.4=\left(x+175\right)\div5+30\)

\(420+260=\left(x+175\right)\div5+30\)

\(680=\left(x+175\right)\div5+30\)

\(650=\left(x+175\right)\div5\)

\(3250=x+175\)

\(3075=x\)

a) 2 * x - 138 = 72

    2 * x          = 72 + 138

    x                = 210 \ 2

    x                = 105

Mk thay x=y nha!!!

a)2xy-138=8x9

2xy-138=72

2xy=72+138

2xy=210

y=210:2

y=105

b){(6xy-72):2-84)}x28=5628

{(6xy-72):2-84)}x28=5628

{(6xy-72):2-84=201

{(6xy-72):2=285

(6xy-72)=570

6y=570+72

6y=642

=>y=107

c)420+65x4=(y+175):5+30

680=(y+175):5+30

650=(y+175):5

3250=y+175

y=3250-175

y=3075

\(Tacó:\)

\(xy=6.UCLN\left(x,y\right)=1\)

\(\Leftrightarrow6=xy=2.3=3.2=1.6=6.1\)

\(+xy=2.3\Rightarrow\left(x,y\right)=1\left(tm\right).Th:xy=3.2\left(tm\right)\)

\(+xy=1.6=6.1\Rightarrow\left(x,y\right)=1\left(tm\right)\)

\(\Rightarrow x,y\in\left\{\left(1;6\right),\left(6;1\right),\left(2;3\right),\left(3;2\right)\right\}\)

đề thiếu à em ?

Nếu như để trên thì x= 204

dạ đề đúng ạ