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

Toán Lớp 6: a,-15/x=25/45 b,21:245=-15:(7x)

Toán Lớp 6: a,-15/x=25/45 b,21:245=-15:(7x)

Comments ( 2 )

  1. $#Cua$
    a) -15/x= 25/45
    => x.25= (-15).45
    => x.25= -675
    => x= -27
    b) 21:245= -15:7x
    => 21/245= -15/7x
    => 21.7x= 245.(-15)
    => 147x= -3675
    => x= -25
     

  2. a, ( – 15 )/x = 25/45
    ⇔ x . 25 = ( – 15 ) . 45
    ⇔ x . 25 = – 675
    ⇔ x = – 675 : 25
    ⇔ x = – 27
    Vậy , x = – 27 .
    b, 21 : 245 = ( – 15 ) : 7x
    ⇔ 21 . 7x = 245 . ( – 15 )
    ⇔ 147x = – 3675
    ⇔ x = – 3675 : 147
    ⇔ x = – 25
    Vậy , x = – 25 .

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

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