(x-1)(x²+2x-3)=
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 11:49:17
(x-1)(x²+2x-3)=
(x-1)(x²+2x-3)=
(x-1)(x²+2x-3)=
解
(x-1)(x²+2x-3)
=x(x²+2x-3)-(x²+2x-3)
=x³+(2x²-x²)+(-3x-2x)+3
=x³+x²-5x+3
=x(x²+2x-3)-1(x²+2x-3)
=x³+2x²-3x-x²-2x+3
=x³+x²-5x+3
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 11:49:17
(x-1)(x²+2x-3)=
(x-1)(x²+2x-3)=
(x-1)(x²+2x-3)=
解
(x-1)(x²+2x-3)
=x(x²+2x-3)-(x²+2x-3)
=x³+(2x²-x²)+(-3x-2x)+3
=x³+x²-5x+3
=x(x²+2x-3)-1(x²+2x-3)
=x³+2x²-3x-x²-2x+3
=x³+x²-5x+3