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

Toán Lớp 6: tính tỷ số A/B biết: A= 34/7.13 + 51/13.22 + 85/22.37 + 68/37 . 49 ; b = 39/7.16 + 65/16/31 + 52/31.43 + 26/43.49

Toán Lớp 6: tính tỷ số A/B biết:
A= 34/7.13 + 51/13.22 + 85/22.37 + 68/37 . 49 ; b = 39/7.16 + 65/16/31 + 52/31.43 + 26/43.49

Comments ( 1 )

  1. Ta có : A/B = ( 34/( 7 . 13 ) + 51/( 13 . 22 ) + 85/( 22 . 37 ) + 68/( 37 . 49 ) )/( 39/( 7 . 16 ) + 65/( 16 . 31 ) + 52/( 31 . 43 ) + 26/( 43 . 49 ) )
    A/B = ( 17/3 . ( 6/( 7 . 13 ) + 9/( 13 . 22 ) + 15/( 22 . 37 )+ 12/( 37 . 49 ) ) )/( 13/3 . ( 9/( 7 . 16 ) + 15/( 16 . 31 ) + 12/( 31 . 43 ) + 6/( 43 . 49 ) )
    A/B = ( 17/3 . ( 1/7 – 1/13 + 1/13 – 1/22 + 1/22 – 1/37 + 1/37 – 1/49 ) )/( 13/3 . ( 1/7 – 1/16 + 1/16 – 1/31 + 1/31 – 1/43 + 1/43 – 1/49 ) )
    A/B = ( 17/3 . ( 1/7 – 1/49 ) )/( 13/3 . ( 1/7 – 1/49 ) )
    A/B = ( 17/3 )/( 13/3 )
    A/B = 17/3 : 13/3
    A/B = 17/13

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