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

Toán Lớp 6: a)4x2x7x(25)x(-3)x5 làm nhanh nhaaa b)(-4)x17x(-5)x3x5

Toán Lớp 6: a)4x2x7x(25)x(-3)x5 làm nhanh nhaaa
b)(-4)x17x(-5)x3x5

Comments ( 2 )

  1. a) 4 xx 2 xx 7 xx (-25) xx (-3) xx 5
    = [4 xx (-25)] xx (2 xx 5) xx [7 xx (-3)]
    = (-100) xx 10 xx (-21)
    = (-1000) xx (-21)
    = 21000
    b) (-4) xx 17 xx (-5) xx 3 xx 5
    = [(-4) xx (-5)] xx 17 xx 3 xx 5
    = 20 xx 17 xx 3 xx 5
    = (20 xx 5) xx 17 xx 3
    = 100 xx 51
    = 5100

  2. Giải đáp:
    a)
    4×2×7×25×(-3)×5
    =(4×-25)×(2×5)×[7×(-3)]
    =-100×10×(-21)
    =-1000×(-21)
    =21000
    b)
    (-4)×17×(-5)×3×5
    =[-4×(-5)×5]×(17×3)
    =(20×5)×51
    =100×51
    =5100

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