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

Toán Lớp 5: tính nhanh a,9/17 x 6/11 x 52/3 x 121 x 5/22 b, 3 2/15 x 2/9 x 2 16/19 : 9 2/5 x 9 1/2 : 2/3

Tháng Hai 20, 2023 Toán học 2 Comments 0 views

Toán Lớp 5: tính nhanh
a,9/17 x 6/11 x 52/3 x 121 x 5/22
b, 3 2/15 x 2/9 x 2 16/19 : 9 2/5 x 9 1/2 : 2/3

Comments ( 2 )

  1. minhtuyethue
    minhtuyethue
    20 Tháng Hai, 2023 at 4:10 sáng
    Reply
    Giải đáp+bước giải:
     a,$\frac{9}{17}$×$\frac{6}{11}$×$\frac{52}{3}$×121×$\frac{5}{22}$ 
    =($\frac{9}{17}$×$\frac{52}{3}$)×($\frac{6}{11}$×121)×$\frac{5}{22}$ 
    =$\frac{156}{17}$×(66×$\frac{5}{22}$ )
    =$\frac{156}{17}$×15
    =$\frac{2304}{17}$
     
    b,3$\frac{2}{15}$×$\frac{2}{9}$×2$\frac{16}{19}$÷9$\frac{2}{5}$×9$\frac{1}{2}$÷$\frac{2}{3}$
    =$\frac{47}{15}$×$\frac{2}{9}$×$\frac{54}{19}$÷$\frac{47}{5}$×$\frac{19}{2}$÷$\frac{2}{3}$
    =$\frac{47}{15}$×$\frac{2}{9}$×$\frac{54}{19}$×$\frac{5}{47}$×$\frac{19}{2}$×$\frac{3}{2}$
    =($\frac{47}{15}$×$\frac{5}{47}$)×($\frac{2}{9}$×$\frac{3}{2}$)×($\frac{54}{19}$×$\frac{19}{2}$)
    =$\frac{1}{5}$×$\frac{1}{3}$×27
    =$\frac{9}{5}$

  2. hauthanhyen98
    hauthanhyen98
    20 Tháng Hai, 2023 at 4:10 sáng
    Reply
    a)9/17 × 6/11 × 52/3 × 121 × 5/22
    = (9/17 × 52/3) × (6/11 × 121) × 5/22
    = 156/17 × (66 × 5/22)
    = 156/17 × 15
    = 2304/17
    b) 3 2/15 × 2/9 × 2 16/19 : 9 2/5 × 9 1/2 : 2/3
    = 47/15 × 2/9 × 54/19 : 47/5 × 19/2 : 2/3
    = 47/15 × 2/9 × 54/19 × 5/47 × 19/2 × 3/2
    =( 47/15 × 5/47) × (2/9 × 3/2) × (54/19 × 19/2)
    = 1/5 × 1/3 × 27
    = 9/5
     
     

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

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