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

Toán Lớp 5: Tính bằng cách thuận tiện: a) 2,5 × 12,85 × 4 b) 13,72 × 12,5 × 8 c) 0,75 × 95 + 1,5 × 2 + 0,75 d) 20,13 × 1,75 – 20,13 × 0,75 Giúp em

Toán Lớp 5: Tính bằng cách thuận tiện:
a) 2,5 × 12,85 × 4
b) 13,72 × 12,5 × 8
c) 0,75 × 95 + 1,5 × 2 + 0,75
d) 20,13 × 1,75 – 20,13 × 0,75
Giúp em với ạ hứa vote 5 sao

Comments ( 2 )

  1. a) 2,5xx12,85xx4
    = (2,5xx4)xx12,85
    = 10xx12,85
    = 128,5
    b) 13,72xx12,5xx8
    = 13,72xx(12,5xx8)
    = 13,72xx100
    = 1372
    c) 0,75xx95+1,5xx2+0,75
    = 0,75xx95+ 0,75xx2xx2+0,75xx1
    = 0,75xx(95+2+2+1)
    = 0,75xx100
    = 75
    d) 20,13xx1,75-20,13xx0,75
    = 20,13xx(1,75-0,75)
    = 20,13xx1
    = 20,13
    @N

  2. a) 2,5 × 12,85 × 4 =
    = (2,5 × 4) × 12,85
    = 10 × 12,85
    = 128,5
    b) 13,75 × 12,5 × 8 =
    = 13,75 × (12,5 × 8)
    = 13,75 × 100
    = 1375
    c) 0,75 × 95 + 1,5 × 2 + 0,75 =
    = 0,75 × 95 + 0,75 × 2 × 2 + 0,75 × 1
    = 0,75 × 95 + 0,75 × 4 + 0,75 × 1
    = 0,75 × (95 + 4 + 1)
    = 0,75 × 100
    = 75
    d) 20,13 × 1,75 – 20,13 × 0,75 =
    = 20,13 × (1,75 – 0,75)
    = 20,13 × 1
    = 20,13
    @Roa
    $#DứaPịNgáo$
     

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

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