231- ( x - 6 ) = 1339 : 13
231- ( x - 6 ) = 103
( x - 6) = 231 - 103
x - 6 = 128
x = 128+6
x= 134
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23 tháng 2 2021 lúc 13:15
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b) \(1+5+9+13+17+...+x=501501\)
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Tìm x