Toán Lớp 4: x * 2 + x * 3 + x * 4 + x = 2130
( x + 1) + ( x +2 ) + ( x + 3 ) + ( x + 4 …. + ( x + 9 ) + ( x + 10) = 2015
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Toán Lớp 4: x * 2 + x * 3 + x * 4 + x = 2130
( x + 1) + ( x +2 ) + ( x + 3 ) + ( x + 4 …. + ( x + 9 ) + ( x + 10) = 2015
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