575 – (6x+70)=445 (x-36):18=12 3.(x-2)+150=240 [3.(x+2):7].4=120 2480-4710:3+[200-(x-5]=1010

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1. a) `575-(6x+70)=445`

   `⇒ 6x+70=575-445`

   `⇒ 6x+70=130`

   `⇒ 6x=130-70=60`

   `⇒ x=60÷6=10`

   b) `(x-36)÷18=12`

   `⇒ x-36=12.18`

   `⇒ x-36=216`

   `⇒ x=216+36`

   `⇒ x=252`

    

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2. Đáp án:

    

   Giải thích các bước giải:

   1) 575-(6x+70)=445

   <=>575-6x-70=445

   <=>-6x=445-575+70

   <=>-6x=-60

   <=>x=10

   2) (x-36):18=12

   <=>(x-36)=12*18

   <=>x-36=216

   <=>x=180

   3) 3(x-2)+150=240

   <=>3(x-2)=240-150

   <=>3(x-2)=90

   <=>x-2=90/3

   <=>x-2=30

   4)[3.(x+2):7].4=120

   <=>[3(x+2):7]=30

   <=>3(x+2)=210

   <=>x+2=70

   <=>x=68

   5) 2480-4710:3+[200-(x-5]=1010

   <=>2480-1570+[200-(x-5)]=1010

   <=>200-(x-5)=100

   <=>-x+5=-100

   <=>-x=-105

   <=>x=105

    

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