问题
计算题
化简:①2x+(x﹣4)﹣(5x﹣4)
②3(a2﹣2a﹣3)﹣5(﹣5a2﹣2)
答案
解:①2x+(x﹣4)﹣(5x﹣4)
=2x+x﹣4﹣5x+4
=﹣2x;
②原式=3a2﹣6a﹣9+25a2+10
=28a2﹣6a+1.
化简:①2x+(x﹣4)﹣(5x﹣4)
②3(a2﹣2a﹣3)﹣5(﹣5a2﹣2)
解:①2x+(x﹣4)﹣(5x﹣4)
=2x+x﹣4﹣5x+4
=﹣2x;
②原式=3a2﹣6a﹣9+25a2+10
=28a2﹣6a+1.