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ntthanhthuy176
2 năm trước
a) ( x + 1 ) + ( x + 2 ) + ... + ( x + 9 ) + ( x + 10 ) = 5 b) ( - 12 ) ^2 . x = 56 - [ ( - 130 ) . x ] c) 15 - ( 30 - x ) = 27 - 2.x
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