6a^2b-(-3a^2b+5ab^2)-2(5a^2b-3ab^2)
=6a^2b+3a^2b-5ab^2-10a^2b+6ab^2
=-a^2b+ab^2
=-2-1/2
=-5/2
6a^2b-(-3a^2b+5ab^2)-2(5a^2b-3ab^2)=?当a=-2,b=1/2时
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