a) 2x -18 = 10

    =>2x = 28

    => x = 14

b) 3x + 26 = 5

=> 3x = -21

=> x = -7

Ai làm cả 2 bài mình tích

a/ 18.17-3.6.7

=18.6.3.(17-7)

=18.6.3.10

18.18.10

3240

a)=18.17-18.7

   =18.(17-7)=18.10=180

b)=54-(6.17+6.9)=54-102-54=(54-54)-102=0-102=-102

c)=(33.17-33.5)-(17.33-17.5)=33.17-33.5-17.33+17.5=(33.17-17.33)-5.(33-17)=0-80=-80

\(a,18.17-3.6.7\)

\(=18.17-18.7\)

\(=18.\left(17-7\right)\)

\(=18.10\)

\(=180\)

\(b,54-6.\left(17+9\right)\)

\(=54-6.17+6.9\)

\(=54-102+54\)

\(=\left(54+54\right)-102\)

\(=108-102\)

\(=6\)

\(c,33.\left(17-5\right)-17.\left(33-5\right)\)

\(=33.17-33.5-17.33-17.5\)

\(=\left(33.17-17.33\right)-\left[5\left(33-17\right)\right]\)

\(=0-5.16\)

\(=-80\)

a) \(18.17-3.6.7\)

\(=18.17-18.7\)

\(=18.\left(17-7\right)\)

\(=18.10\)

\(=180\)

b) \(54-6.\left(17+9\right)\)

\(=54-102-54\)

\(=-102\)

c) \(33.\left(17-5\right)-17.\left(33-5\right)\)

\(=561-165-561+85\)

\(=-80\)

a , 18 . 17 - 3 . 6 . 7

= 18 .17 - 18 . 7

= 18 . ( 17 - 7 )

= 18 . 10

= 180

b , 54 - 6 . ( 17 + 9 )

= 54 - 6 . 17 + 6 . 9

= 54 - 102 + 54

= ( 54 - 54 ) - 102

= 0 - 102

= - 102

c , 33 . ( 17 - 5 ) - 17 . ( 33 - 5 )

= 33 . 17 - 33 . 5 - 17 . 33 - 17 .5

= 0 - 5 . 16

= 0 - 80

= - 80

a.18.17-3.6.7
 =18.17-18.7
 =18.(17-7)
 =18.10=180
b.54-6.(17+9)
 =54-6.26
 =54-156=-102
c.33.(17-5)-17.(33-5)
 =33.17-33.5-17.33+17.5
 =33.5+17.5
 =(33+17).5
 =50.5=250

a) 180

c) -80

câu b phép tính sai r

c) = 33 .17 - 33 . 5 -17.33+17-5

=5.(17-33)

=5.(-16)

= -80

a) 18.17 - 3.6.7

= 18.17-18.7

=18.( 17 - 7 )

= 18 . 10

= 180

b) 54 - 6.( 17 + 9) 

= 6.9 - 6 . 26

= 6.( 9 - 26 ) 

= 6 . ( - 17 ) 

= -102

c) 33.(17 - 5 ) - 17.(33-5)

= 33.17 - 33 .3  - 17.33 -  17 . 5 

= 33.17 + ( -33 ) .3 + ( - 17) .33 + ( -17) .5

= 33.17 + ( - 17) . 33 + 33 . ( - 3) + ( -17 ) .5

= 33. [ 17 + ( -17 ) + ( - 3 )] + (-17) . 5

= 33 . ( - 3 ) + ( -17 ) .5

= -99 + ( - 85)

= -184

a) 18 . 17 - 3 . 6 . 7                   b) 54 - 6 . ( 17 + 9 )                             

= 306      - 126                           = 48  . 26                                            

= 180                                        = 1248

,mk giúp đc từng đó nha

b) 54-6(17+9)=6.9-6.17-6.9=(6.9-6.9)-17.6=0-102=-102

c) =33.17-33.5-17.33+17.5=33.(17-17)-5.(33-17)=33.0-5.16=0-80=-80

a) 18.17-3.6.7=18.17-18.7=18(17-7)=18.10=180

a)   \(18.17-3.6.7\)

\(=18.17-18.7\)

\(=18\left(17-7\right)\)

\(=18.10=180\)

c)   \(33\left(17-5\right)-17.\left(33-5\right)\)

\(=33.17-33.5-17.33+5.17\)

\(=5\left(17-33\right)\)

\(=5.\left(-16\right)=-80\)

a, 18.17-3.6.7            b,54-6.(17+5)      c,33.(17.5)-17.(33-5)

=18.17-18.7               =6.9-6.22            =33.17.5-17.(33-5)

=18.(17-17)                =6.(9-22)            =17.(33.5)-17.(33-5)

=18.10                        =6.(-13)              =17.165-17.28        

=18.10                        =6.(-13)              =17.(165-28)

=180                           =-78                    =17.137

                                                              =2329

a)

b)

c)

a) 18.17 - 3.6.7

= 18.17 - 18.7

= 18.(17 - 7 )

= 18 . 10

= 180

b) 54 - 6.(17 + 9)

= 6.9 - 6.17 + 6.9

= (6.9 - 6.9) - 6.17

= 0 - 6.17

= 0 - 102

= -102

c) 33.(17 - 5) - 17.(33 - 5)

= 33.17 - 33.5 - 17 . 33 - 17.5

= 33.(17 - 17) - 5.(33 - 17 )

= 33. 0 - 5.16

= 0 - 80

= -80

a, 18.17 - 3.6.7 = 18.17 - 18.7

= 18 ( 17 - 7 )

= 18 . 10

= 180

b, 54 - 6( 17 + 9 ) = 6.9 - 6 ( 17 + 9 )

= 6 ( 9-17-9 )

= 6 . (-17 )

= -102

c, 33.(17-5 ) -17 ( 33-5 ) = 33. 17 - 33.5 - 17.33 + 17 . 5

= 17.5 - 33.5

= 5 ( 17 - 33 )

= 5 . ( -16 )

= -80