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

Toán Lớp 4: a)4855÷x-130÷x=15 b)2500÷(x×10)=50 c)(128×x)÷64=314

Toán Lớp 4: a)4855÷x-130÷x=15 b)2500÷(x×10)=50 c)(128×x)÷64=314

Comments ( 2 )

  1. a)
    4855 : x – 130 : x = 15
    ( 4855 – 130 ) : x = 15
    4725 : x = 15
    x = 4725 : 15
    x = 315
    b) 
    2500 : ( x xx 10 ) = 50
    x xx 10 = 2500 : 50
    x xx 10 = 50
    x = 50 : 10
    x = 5
    c)
    ( 128 xx x ) : 64 = 314
    128 xx x = 314 xx 64
    128 xx x = 20096
    x = 20096 : 128
    x = 157

  2. a) 4855 : x – 130 : x = 15
    ⇒ ( 4855 – 130 ) : x = 15
    ⇒ 4725 : x = 15
    ⇒ x = 4725 : 15
    ⇒ x = 315
    b) 2500 : ( x × 10 ) = 50
    ⇒ x × 10 = 2500 : 50
    ⇒ x × 10 = 50
    ⇒ x = 50 : 10
    ⇒ x = 5
    c) ( 128 × x ) : 64 = 314
    ⇒ 128 × x = 314 × 64
    ⇒ 128 × x = 20096
    ⇒ x = 20096 : 128
    ⇒ x = 157
     

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