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问题: 详细解答

(x+1)(x+2)(2x-1)(x+5)-3(X^2-6x-1)其中x=3.5

解答:

(x+1)(x+2)(2x-1)(x+5)-3(X^2-6x-1)带入x=3.5
=(3.5+1)(3.5+2)(2*3.5-1)(3.5+5)-3(3.5^2-6*3.5-1)
=4.5*5.5*6*8.5-3*(12.25-21-1)
=1262.25+29.25
=1291.5