(1)(X³-2x²+x-4)-(2x³-5x-4) (2)3(a²-2a-3)
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(1)(X³-2x²+x-4)-(2x³-5x-4) (2)3(a²-2a-3)-5(-5a²+a-2)
![(1)(X³-2x²+x-4)-(2x³-5x-4) (2)3(a²-2a-3)](/uploads/image/z/20132739-27-9.jpg?t=%281%29%EF%BC%88X%26%23179%3B-2x%26%23178%3B%2Bx-4%29-%282x%26%23179%3B-5x-4%29+%EF%BC%882%293%28a%26%23178%3B-2a-3%29)
(X³-2x²+x-4)-(2x³-5x-4)
=x³-2x²+x-4-2x³+5x+4
=x³-2x³-2x²-4+4
=-x³-2x²
3(a²-2a-3)-5(-5a²+a-2)
=3a²-6a-9+25a²-5a+10
=3a²+25a²-6a-5a-9+10
=28a²-11a+1
=x³-2x²+x-4-2x³+5x+4
=x³-2x³-2x²-4+4
=-x³-2x²
3(a²-2a-3)-5(-5a²+a-2)
=3a²-6a-9+25a²-5a+10
=3a²+25a²-6a-5a-9+10
=28a²-11a+1
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