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

Toán Lớp 7: Tìm x,y (Nếu có): 1) (x-1)^7=(x-3)^3 2) 10^x:5^y=20^y (Với x,y thuộc N)

Toán Lớp 7: Tìm x,y (Nếu có):
1) (x-1)^7=(x-3)^3
2) 10^x:5^y=20^y (Với x,y thuộc N)

Comments ( 1 )

  1. 1)(x-1)^7=(x-1)^3
    ⇔(x-1)^4=0
    ⇔x-1=0
    ⇔x=1
    2)10^x :5^y=20^y
    ⇔10^x=20^y .5^y
    ⇔10^x=100^y
    ⇔10^x=(10^2)^y
    ⇔10^x=10^(2y)
    ⇔x=2y

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

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