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

Toán Lớp 4: a, 8 x 427 x 3 + 6 x 573 x 4 b, 6 x 1235 x 20 – 5 x 235 x 24 c, (145 x 99 +145) – 143 x 101 – 143 d, 54 x 47 – 47 x 53 – 20 – 27

Tháng Tư 18, 2022 Toán học 2 Comments 0 views

Toán Lớp 4: a, 8 x 427 x 3 + 6 x 573 x 4
b, 6 x 1235 x 20 – 5 x 235 x 24
c, (145 x 99 +145) – 143 x 101 – 143
d, 54 x 47 – 47 x 53 – 20 – 27

Comments ( 2 )

  1. mytamhoang
    mytamhoang
    18 Tháng Tư, 2022 at 9:46 sáng
    Reply
    a)
    8 × 427 × 3 + 6 × 573 × 4
    = 8 × 427 × 3 + 2 × 3 × 573 × 4
    = 8 × 427 × 3 × 3 × 573 × 8
    = 8 × 3 × ( 427 + 573 )
    = 24 × 1000
    = 24000
    b)
    6 × 1235 × 20 – 5 × 235 × 24
    = 6 × 1235 × 4 × 5 – 5 × 235 × 24
    = 24 × 1235 × 5 – 5 × 235 × 24
    = 24 × 5 × ( 1235 – 235 )
    = 120 × 1000
    = 120000
    c)
    ( 145 × 99 + 145 ) – 143 × 101 – 143
    = ( 145 × 99 + 145 × 1 ) – 143 × 101 – 143 × 1
    = [ 145 × ( 99 + 1 ) ] – 143 × ( 101 – 1)
    = [ 145 × 100 ] – 143 × 100
    = 14500 – 14300
    = 200
    d)
    54 × 47 – 47 × 53 – 20 – 27
    = 47 × ( 54 – 53 ) – ( 20 + 27 )
    = 47 × 1 – 47
    = 47 – 47
    = 0
    @Tina

  2. khanhngantoan
    khanhngantoan
    18 Tháng Tư, 2022 at 9:45 sáng
    Reply
    Giải đáp:
    a) 8 x 427 x 3 + 6 x 573 x 4 = 24 000
    b) 6 x 1235 x 20 – 5 x 235 x 24 = 120 000
    c) (145 x 99 +145) – 143 x 101 – 143 = 200
    d) 54 x 47 – 47 x 53 – 20 – 27 = 0
     

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

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