(3a²+4a-1)-2(5-3a+5a²)
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(3a²+4a-1)-2(5-3a+5a²)(3a²+4a-1)-2(5-3a+5a²)(3a²+4a-1)-2(5-3a+5a²)原式=3
(3a²+4a-1)-2(5-3a+5a²)
(3a²+4a-1)-2(5-3a+5a²)
(3a²+4a-1)-2(5-3a+5a²)
原式
=3a^2+4a-1-10+6a-10a^2
=-7a^2+10a-11