585-(7x+60)=455 160 – 160: (18- x) = 80 49-3( x + 6 ) = 13

Question

585-(7x+60)=455
160 – 160: (18- x) = 80
49-3( x + 6 ) = 13

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Amity 8 tháng 2020-11-01T07:00:14+00:00 2 Answers 84 views 0

Answers ( )

  1. 585-(7x+60)=455

    => -( 7x + 60 ) = 455 – 585

     =>-7x – 60 = -130

    =>-7x = -70

    => x = 10

    160 – 160: (18- x) = 80

    =>-160 : (18-x) = -80

    =>18 – x = 2

    => -x =-16

    => x=16

    49-3( x + 6 ) = 13

    =>-3(x+6) = -36

    => x+6 =12

    =>x= 6

  2. 585 – (7x+60) = 455

    ⇒ 7x + 60 = 585 – 455

    ⇒ 7x + 60 = 130

    ⇒ 7x = 130 – 60

    ⇒ 7x = 70

    ⇒ x = 70 : 7

    ⇒ x = 10

    160 – 160: (18- x) = 80

    ⇒ 160 : (18 – x) = 160 – 80

    ⇒ 160 : (18-x) = 80

    ⇒ 18 – x = 160 : 80

    ⇒ 18 – x = 2

    ⇒ x = 18 – 2 

    ⇒ x = 16

    49 – 3 (x + 6) = 13

    ⇒ 3(x+6) = 49 – 13

    ⇒ 3(x+6) = 36

    ⇒ x+6 = 36 : 3

    ⇒ x + 6 = 12

    ⇒ x = 12 – 6

    ⇒ x = 6

    Chúc bạn học tốt!

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