Toán Lớp 6: Tìm x , biết :
1^3 + 2^3 + … + 10^3 = ( x + 1 )^2
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Toán Lớp 6: Tìm x , biết :
1^3 + 2^3 + … + 10^3 = ( x + 1 )^2
Comments ( 2 )
<=>3025 = (x + 1)^{2}
TH1 : (-55)^{2} = (x + 1)^{2}
<=>x + 1 = -55
<=>x = -55 – 1 =-56
TH2 : 55^{2} = (x + 1)^{2}
<=>x + 1 = 55
<=>x = 55 – 1 = 54
Vậy x \in {-55;54}