计算:a²-4b²-3(a²-4b²)-a²+4b²-5(a²-b)-b+a²
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计算:a²-4b²-3(a²-4b²)-a²+4b²-5(a²-b)-b+a²
计算:a²-4b²-3(a²-4b²)-a²+4b²-5(a²-b)-b+a²
计算:a²-4b²-3(a²-4b²)-a²+4b²-5(a²-b)-b+a²
a²-4b²-3(a²-4b²)-a²+4b²-5(a²-b)-b+a²
=a²-4b²-3a²+12b²-a²+4b²-5a²+5b-b+a²
=-7a²+12b²+4b
-7a方+12b方+4b