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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Tìm x biết: a) 5 (x + 35) = 515 b, a) 515 : (x + 35) = 5 c, 219 – 7(x + 1) = 100 d, (x – 17). 200 = 400

Toán Lớp 6: Tìm x biết:
a) 5 (x + 35) = 515 b, a) 515 : (x + 35) = 5 c, 219 – 7(x + 1) = 100 d, (x – 17). 200 = 400

Comments ( 2 )

  1. a) 5 (x + 35) = 515
    to x+35=515:5
    to x+35=103
    to x=103-35
    to x=68
    b, 515:(x+35)=5
    to x+35=515:5
    to x+35=103
    to x=103-35
    to x=68
    c, 219 – 7(x + 1) = 100
    to 7(x+1)=219-100
    to 7(x+1)=119
    to x+1=119:7
    to x+1=17
    to x=16
    d, (x – 17). 200 = 400
    to x-17=400:200
    to x-17=2
    to x=19
     

  2. Tìm x biết:
    a) 5 (x + 35) = 515
    ⇒    (x + 35) =515 : 5
    ⇒    (x + 35) =103
    ⇒     x           =103 – 35
    ⇒     x           =68
       Vậy x=68
    b) 515 : (x + 35) = 5
    ⇒          (x + 35) = 515 : 5
    ⇒          (x + 35) = 103
    ⇒           x           =103 – 35
    ⇒           x           =68
        Vậy x=68
    c) 219 – 7(x + 1) = 100
    ⇒          7(x + 1) = 219 – 100
    ⇒          7(x + 1) = 119
    ⇒            (x + 1) = 119 : 7
    ⇒            (x + 1) = 17
    ⇒             x         = 17 – 1 
    ⇒             x         = 16
          Vậy x=16
    d) (x – 17). 200 = 400
    ⇒ (x – 17)    = 400 : 200
    ⇒ (x – 17)    = 2
    ⇒ x              =2 + 17
    ⇒ x              =19
           Vậy x= 19
    Xin ctlhn ạ????
    CHÚC BN HỌC TỐT????????

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222-9+11+12:2*14+14 = ? ( )