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

Toán Lớp 8: (145 x 99 +145) – 143 x 101 – 143 d, 54 x 47 – 47 x 53 – 20 – 27

Toán Lớp 8: (145 x 99 +145) – 143 x 101 – 143 d, 54 x 47 – 47 x 53 – 20 – 27

Comments ( 2 )

  1. c) (145 xx 99 + 145) – 143 xx 101 – 143
    = [145xx( 99 + 1)] – 143xx(101 – 1)
    = (145xx 100) – 143xx 100
    = 14500 – 14300
    = 200
    d) 54xx47 – 47xx 53 – 20 – 27
    = 47xx( 54 – 53) – 47
    = 47 – 47
    = 0

  2. Giải đáp+Lời giải và giải thích chi tiết:
     ( 145 x 99 + 145 ) – 143 x 101 – 143
    = [ 145 x ( 99 + 1 )] – 143 x ( 100 + 1 ) – 143
    = 145 x 100 – 143 x 100 – 143 – 143
    = 100 x ( 145 – 143 ) – 2 x 143
    = 100 x 2 – 2 x 143
    = 2 x ( 100 – 143 )
    = 2 x ( -43 )
    = -86
    d) 54 x 47 – 47 x 53 – 20 – 27
    = 47 x ( 54 – 53 ) – 20 – 27
    = 47 x 1 – 20 – 27
    = 47 – 20 – 27
    = 0
    TRUNG THU ZUI ZẺE!!

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

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