计算:5a²-[a²+(5a²-2a)-2(a²-3a)]
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计算:5a²-[a²+(5a²-2a)-2(a²-3a)]
计算:5a²-[a²+(5a²-2a)-2(a²-3a)]
计算:5a²-[a²+(5a²-2a)-2(a²-3a)]
原式=5a^2-(a^2+5a^2-2a-2a^2+6a)
=5a^2-a^2-5a^2+2a+2a^2-6a
=(5-1-5+2)a^2+(2-6)a
=a^2-4a