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

Toán Lớp 4: Bài 4: Tính nhanh: a, 4 x 125 x 25 x 8 b, 2 x 8 x 50 x 25 x 125 c, 2 x 3 x 4 x 5 x 50 x 25 d, 25 x 20 x 125 x 8 – 8 x 20 x 5 x 125

Toán Lớp 4: Bài 4: Tính nhanh:
a, 4 x 125 x 25 x 8 b, 2 x 8 x 50 x 25 x 125
c, 2 x 3 x 4 x 5 x 50 x 25 d, 25 x 20 x 125 x 8 – 8 x 20 x 5 x 125 Bài 5: Tính nhanh:
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. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    a)4×125×25×8=(4×25)×(8×125)=100×1000=100000
     b)100 × 1000 × 25= 100000 × 25= 2500000
    c)(2×50)x(4×25)x(3×5)=100x100x15=150000
    d)
    = ( 8 – 8 ) x 25 x 20 x 125 x 20 x 5 x 15
    = 0 x 25 x 20 x 125 x 20 x 5 x 15
    = 0 ( vì số nào nhân 0 cũng bằng 0 )
    5.
    =(8×3)×427+(6×4)×573
    =24×427+24×573
    =24×(427+573)
    =24×1000=24000
    b/ 6×1235×20-5×235×24
    =(6×20)×1235-(5×24)×235
    =120×1235-120×235
    =120×(1235-235)
    =120×1000=120000
    c/
    (145×99+145)-(143×101-143)
    =145x(99+1)-143x(101-1)
    =145×100-143×100
    =14500-14300
    =200
    vì mọi số nhân vs 1 bằng chính nó mà
    d/
    47x(54-53)-(20+27)
    =47×1-47
    =47-47
    =0

  2. Bài 4: Tính nhanh:
    a,4 × 125 × 25 × 8
    = 4 × 25 ×125 × 8
    = 100 × 1000
    = 100000
    b,2 × 8 × 50 × 25 × 125
    = 2 × 50 × 8 × 125 × 25
    = 100 × 1000 × 25
    = 2500000
    c,2 × 3 × 4 × 5 × 50 × 25
    = 2 × 50 × 4 × 25 × 3 × 5
    = 100 × 100 × 15
    = 150000
    d, 25 × 20 × 125 × 8 8 × 20 × 5 × 125
    = 8 × 125 × 20 × 25 8 × 125 × 20 × 5
    = 1000 × 20 × 25 1000 × 20 × 5
    = 20000 × 25 20000 × 5
    = 20000 × ( 25 – 5 )
    = 20000 × 20
    = 400000
    Bài 5 : Tính nhanh :
    a,8 × 427 × 3 + 6 × 573 × 4
    = 2 × 4 × 427 × 3 + 6 × 573 × 4
    = 2 × 3 × 4 × 427 + 6 × 4 × 573
    = 6 × 4 × 427 + 6 × 4 × 573
    = 24 × 427 + 24 × 573
    = 24 × ( 427 + 573 )
    = 24 × 1000
    = 24000
    b, 6 × 1235 × 20 5 × 235 × 24
    = 6 × 1235 × 4 × 5 5 × 235 x 24
    = 6 × 4 × 5 × 1235 24 × 5 × 235
    = 24 × 5 × 1235 24 × 5 × 235
    = 120 × 1235 120 × 235
    = 120 × ( 1235 235 )
    = 120 × 1000
    = 120000
    c,( 145 × 99 + 145 ) 143 × 101 143
    = 145 × ( 99 + 1 ) – 143 × ( 101 – 1 )
    = 145 × 100 – 143 × 100
    = 14500 – 14300
    = 2
    d,54 × 47 47 × 53 20 27
    = 47 × 54 47 × 53 20 27
    = 47 × ( 54 53 ) 20 27
    = 47 × 1 20 27
    = 47 20 27
    = 47 ( 20 + 27 )
    = 47 – 47
    = 0
                 $#KNOIDAU$
             #chucbanhoctotnha#

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

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