问题
解答题
(1)求整式
(2)练习:一个多项式加上-5
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答案
(1)(x2-7x-2)-(-2x2+4x-1)
=x2-7x-2+2x2-4x+1
=2x2-11x-1;
(2)设这个多项式是A,
∵A+(-5x2-4x-3)=-x2-3x,
∴A=(-x2-3x)-(-5x2-4x-3)
=-x2-3x+5x2+4x+3
=4x2+x+3.
(1)求整式
(2)练习:一个多项式加上-5
|
(1)(x2-7x-2)-(-2x2+4x-1)
=x2-7x-2+2x2-4x+1
=2x2-11x-1;
(2)设这个多项式是A,
∵A+(-5x2-4x-3)=-x2-3x,
∴A=(-x2-3x)-(-5x2-4x-3)
=-x2-3x+5x2+4x+3
=4x2+x+3.