问题
解答题
计算下列各题 (1)x2(x-1)-2x(x2-2x+3) (2)
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答案
(1)x2(x-1)-2x(x2-2x+3)
=x3-x2-2x3+4x2-6x
=-x3+3x2-6x.
(2)原式=4×(25+24)×(25-24)
=4×49×1
=14.
计算下列各题 (1)x2(x-1)-2x(x2-2x+3) (2)
|
(1)x2(x-1)-2x(x2-2x+3)
=x3-x2-2x3+4x2-6x
=-x3+3x2-6x.
(2)原式=4×(25+24)×(25-24)
=4×49×1
=14.