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

Toán Lớp 7: Tính `A={12+12/13-12/17}/{4-4/17+4/13}:{3/19+3/21}/{91/19+91/21}.{40.50+(-1)^2}/{40+50+(-1)^2`

Tháng Chín 23, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: Tính
A={12+12/13-12/17}/{4-4/17+4/13}:{3/19+3/21}/{91/19+91/21}.{40.50+(-1)^2}/{40+50+(-1)^2

Comments ( 2 )

  1. daithanh
    daithanh
    23 Tháng Chín, 2022 at 8:56 chiều
    Reply
    Xin hay nhất nhé tus ^_^
    A = $\dfrac{12+\dfrac{12}{13}-\dfrac{12}{17}}{4-\dfrac{4}{17}+\dfrac{4}{13}}$ : $\dfrac{\dfrac{3}{19}+\dfrac{3}{21}}{\dfrac{91}{19}+\dfrac{91}{21}}$ . $\dfrac{40.50+(-1)^{2}}{40+50+(-1)^{2}}$
        = $\dfrac{12.(1+\dfrac{1}{13}-\dfrac{1}{17})}{4.(1-\dfrac{1}{17}+\dfrac{1}{13})}$ : $\dfrac{3.(\dfrac{1}{19}+\dfrac{1}{21})}{91.(\dfrac{1}{19}+\dfrac{1}{21})}$ . $\dfrac{2000+1}{90+1}$
        = $\dfrac{12}{4}$ : $\dfrac{3}{91}$ . $\dfrac{2001}{91}$
        = 3. $\dfrac{91}{3}$ . $\dfrac{2001}{91}$
        = $\dfrac{3.91.2001}{3.91}$
        = 2001
    Vậy A=2001

  2. huenthanh97
    huenthanh97
    23 Tháng Chín, 2022 at 8:56 chiều
    Reply
    Giải đáp:
    A=(12+12/13-12/17)/(4-4/17+4/13):(3/19+3/21)/(91/19+91/21).(40.50+(-1)^2)/(40+50+(-1)^2)
      = (12(1+1/13-1/17))/(4(4-1/17+1/13)):(3(1/19+1/21))/(91(1/19+1/21)).(40.50+1)/(40+50+1)
      = 12/4 : 3/91 . 2001/91
      = 3 . 91/3 . 2001/91
      = 91 . 2001/91
      = 2001
     

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

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