化简（1）-2/3ab^3+2a^2b-1/2a^3b-2ab^2-1/2a^2b-a^3b (2)(x^3-2x^2+x-4)-(2x^3-5x-4)
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(1)-2/3ab^3+2a^2b-1/2a^3b-2ab^2-1/2a^2b-a^3b
=-2/3ab^3+3/2a^2b-3/2a^3b-2ab^2
(2)(x^3-2x^2+x-4)-(2x^3-5x-4)
=x^3-2x^2+x-4-2x^3+5x+4
=-x^3-2x^2+6x
(3)3(a^2 -2a-3)-5(-5a^2+a-2)
=3a^2 -6a-9+25a^2-5a+10
=28a^2 -11a+1
=-2/3ab^3+3/2a^2b-3/2a^3b-2ab^2
(2)(x^3-2x^2+x-4)-(2x^3-5x-4)
=x^3-2x^2+x-4-2x^3+5x+4
=-x^3-2x^2+6x
(3)3(a^2 -2a-3)-5(-5a^2+a-2)
=3a^2 -6a-9+25a^2-5a+10
=28a^2 -11a+1
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(1)-2/3ab^3+2a^2b-1/2a^3b-2ab^2-1/2a^2b-a^3b
=-2/3ab^3+3/2a^2b-3/2a^3b-2ab^2
(2)(x^3-2x^2+x-4)-(2x^3-5x-4)
=x^3-2x^2+x-4-2x^3+5x+4
=-x^3-2x^2+6x
(3)3(a^2 -2a-3)-5(-5a^2+a-2)
=3a^2 -6a-9+25a^2-5a+10
=28a^2 -11a+1
=-2/3ab^3+3/2a^2b-3/2a^3b-2ab^2
(2)(x^3-2x^2+x-4)-(2x^3-5x-4)
=x^3-2x^2+x-4-2x^3+5x+4
=-x^3-2x^2+6x
(3)3(a^2 -2a-3)-5(-5a^2+a-2)
=3a^2 -6a-9+25a^2-5a+10
=28a^2 -11a+1
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