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

Toán Lớp 6: k) (-77). (127 – 316) – 127. (316 – 77) l) 25. 74 + (-25).(-26) m) (-25).74 + 25. (-26) m) (-25).74 + 25. (-26)

Toán Lớp 6: k) (-77). (127 – 316) – 127. (316 – 77)
l) 25. 74 + (-25).(-26) m) (-25).74 + 25. (-26)
m) (-25).74 + 25. (-26)

Comments ( 1 )

  1.    Ron
    k, (-77) . (127 – 316) – 127. (316 – 77)
    = -77 . 127 – (-77) . 316 – 127 . 316 – 127 . 77
    = -77 . 127 + 77 . 316 – 127 . 316 – 127 . 77
    = (-77 . 127 – 127 . 77) + (77 . 316 – 127 . 316)
    = 0 + 316 . (77 – 127)
    = 316 . (-50)
    = -15800
    l, 25 . 74 + (-25) . (-26) 
    = 25 . 74 + 25 . 26
    = 25 . (74 + 26)
    = 25 . 100
    = 2500
    m, (-25) . 74 + 25 . (-26)
    = 25 . (-74) + 25 . (-26)
    = 25 . [-74 + (-26)]
    = 25 . (-100)
    = -2500
       #Chúc bạn học tốt
      Xin hay nhất

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

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