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

Toán Lớp 4: a.7/9 + 3/10. b.7/8 – 7/9. c.3 + 2/5. d.4 – 5/7. e.3/10 × 4/9. g.4 × 9/8. h.6/5 : 3/7

Tháng Chín 21, 2022 Toán học 2 Comments 0 views

Toán Lớp 4: a.7/9 + 3/10. b.7/8 – 7/9. c.3 + 2/5. d.4 – 5/7.
e.3/10 × 4/9. g.4 × 9/8. h.6/5 : 3/7

Comments ( 2 )

  1. thudan
    thudan
    21 Tháng Chín, 2022 at 5:14 sáng
    Reply
    a)
    7/9+3/10
    =70/90+27/90
    =97/90
    b)
    7/8-7/9
    =63/72-56/72
    =7/72
    c)
    3+2/5
    =15/5+2/5
    =17/5
    d)
    4-5/7
    =28/7-5/7
    =23/7
    e)                
    3/10×4/9
    =(3×4)/(10×9)                    
    =(3×2×2)/(2×5×3×3)           
    =2/(5×3)               
    =2/15  
    g)
    4×9/8
    =(4×9)/8
    =(4×9)/(2×4)
    =9/2
    h)
    6/5:3/7
    =6/5×7/3
    =(6×7)/(5×3)
    =(2×3×7)/(5×3)
    =(2×7)/5
    =14/5
     

  2. dananhthumai
    dananhthumai
    21 Tháng Chín, 2022 at 5:14 sáng
    Reply
    a)7/9 + 3/10
    = 70/(90) + 27/(90)
    = 97/90
    b) 7/8 – 7/9
    = 63/72 – 56/72
    = 7/72
    c) 3 + 2/5
    = 3/1 + 2/5
    = 15/5 + 2/5
    = 17/5
    d) 4 – 5/7
    = 4/1 – 5/7
    = 28/7 – 5/7
    = 23/7
    e) 3/10 × 4/9
    = (3 × 4)/(10×9)
    = 12/90
    = 2/15
    g) 4 × 9/8
    = 4/1 × 9/8
    = (4×9)/(1×8)
    = 36/8
    = 9/2
    h) 6/5 : 3/7
    = 6/5 × 7/3
    = (6×7)/(5×3)
    = 42/15
    = 14/5

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

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