(x-1)(2x+1)-2(x-5)(x+2)详细的每一步解题过程
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(x-1)(2x+1)-2(x-5)(x+2)详细的每一步解题过程(x-1)(2x+1)-2(x-5)(x+2)详细的每一步解题过程(x-1)(2x+1)-2(x-5)(x+2)详细的每一步解题过程(
(x-1)(2x+1)-2(x-5)(x+2)详细的每一步解题过程
(x-1)(2x+1)-2(x-5)(x+2)详细的每一步解题过程
(x-1)(2x+1)-2(x-5)(x+2)详细的每一步解题过程
(x-1)(2x+1)-2(x-5)(x+2)
=2x^2-x-2-2(x^2-3x-10)
=2x^2-x-2-2x^2+6x+20
=2x^2-2x^2+6x-x-2+20
=5x+18
(x-1)(2x+1)-2(x-5)(x+2)
=2x^2+x-2x-1-2(x^2+2x-5x-10)
=2x^2-x-1-2(x^2-3x-10)
=2x^2-x-1-2x^2+6x+20
=5x+19
=2x平方+x-2x-1-2(x平方+2x-5x-10)
=2x平方+x-2x-1-2x平方-4x+10x+20
=5x+19
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