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

Toán Lớp 5: a) 2,5 x 125 x 4 x 8 b) 98,7 x2,9 – 68,7×2,9-28,7 x 2,9

Toán Lớp 5: a) 2,5 x 125 x 4 x 8
b) 98,7 x2,9 – 68,7×2,9-28,7 x 2,9

Comments ( 2 )

  1. ~ Gửi cọu  (◍•ᴗ•◍)~
    a) 2,5xx125xx4xx8
    = (2,5xx4)xx(125xx8)
    = 10xx1000
    = 10 000
    b) 98,7xx2,9-68,7xx2,9-28,7xx2,9
    = 2,9xx(98,7-68,7-28,7)
    = 2,9xx1,3
    = 3,77

  2. Giải đáp:
    a) 2,5 x 125 x 4 x 8
    =( 2,5×4 ) x ( 125×8 )
    =10 x 1000
    =10000.
    b) 98,7 x2,9 – 68,7×2,9-28,7 x 2,9
    =(98,7-68,7-28,7) x 2,9
    =1,3 x 2,9
    =3,77.
    xin hay nhất

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