问题
计算题
化简:(5a2﹣2a+3)﹣(1﹣2a+a2)+3(﹣1+3a﹣a2).
答案
解:原式=5a2﹣2a+3﹣1+2a﹣a2﹣3+9a﹣3a2
=(5a2﹣a2﹣3a2)+(﹣2a+2a+9a)+(3﹣1﹣3)
=a2+9a﹣1.
化简:(5a2﹣2a+3)﹣(1﹣2a+a2)+3(﹣1+3a﹣a2).
解:原式=5a2﹣2a+3﹣1+2a﹣a2﹣3+9a﹣3a2
=(5a2﹣a2﹣3a2)+(﹣2a+2a+9a)+(3﹣1﹣3)
=a2+9a﹣1.