3x(x+1) - + = 3*9(9+1) - 3* + = 27*10 - 3*81 + 3 = 270-243+3 = 27+3 = 30
ODP. B
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3x(x+1) - + = 3*9(9+1) - 3* + = 27*10 - 3*81 + 3 = 270-243+3 = 27+3 = 30
ODP. B