ra 34 và - 20 

mk làm rùi đó ,bài dưới ế ,rõ ràng rành mạch lên pạn mk nha 

|7- x|=(-13)-5.(-8)

|7- x|=144

7- x=144

      x=7-144

        x=(-137)

Vậy : x=(-137); x=137

ọilmk

= 35 . 34 + 35 . 38 + 65 . (-75 ) + 65 . ( -45 )

= 35 . ( 34 + 38 ) + 65 . ( -75 - 45 ) 

= 35 . 72 + 65 . ( -120 )

= 2520 - 7800 

= -5280 

35.34+(-35).(-38)+65.(-75)+(-65).45

= 35 . 34 + 35 . 38 + 65 . (-75 ) + 65 . ( -45 )

= 35 . ( 34 + 38 ) + 65 . ( -75 - 45 ) 

= 35 . 72 + 65 . ( -120 )

= 2520 - 7800 

= -5280 

xin like

6528=?m2 =? dm2

mờ mờ ảo ảo , nhìn lác mắt!

help me

x:54+x:16=217

x:(54+16)=217

x:70=217

x   =217*70

x   =15190

x:[16=54] =217

x ; 70 =217

x =217 nhân 70 = 15190

x = 15190

Có số pt là: ( 100 - 1 ) : 3 + 1 = 34 số

có số cặp là: 34 : 2 = 17 cặp

-3 + -3 + -3 + ......... + -3

= -3 . 17 = -51

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