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

Toán Lớp 6: giải hộ với ạ a) ????+70=445 b) 435−????=158 c) (????−53):12=15 d) 3????−105:21=10

Toán Lớp 6: giải hộ với ạ
a) ????+70=445
b) 435−????=158
c) (????−53):12=15
d) 3????−105:21=10

Comments ( 2 )

  1. a) ????+70=445
    ⇒x=445-70
    ⇒x=375
    b)435−????=158
    ⇒-x=-277
    ⇒x=277
    c) (????−53):12=15
    ⇒x-53=180
    ⇒x=233
    d) 3????−105:21=10
    ⇒3x-5=10
    ⇒3x=15
    ⇒x=5

  2. a,
    x+70=445
    ⇔x=445-70
    ⇔x=375
    b,
    435-x=158
    ⇔x=435-158
    ⇔x=277
    c,
    (x-53):12=15
    ⇔x-53=180
    ⇔x=233
    d,
    3x-105:21=10
    ⇔3x-5=10
    ⇔3x=15
    ⇔x=5

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

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