问题
计算题
化简:2(3x2﹣2x+1)﹣(5﹣2x2﹣7x).
答案
解:2(3x2﹣2x+1)﹣(5﹣2x2﹣7x),
=6x2﹣4x+2﹣5+2x2+7x,
=(6+2)x2+(7﹣4)x﹣5+2,
=8x2+3x﹣3.
化简:2(3x2﹣2x+1)﹣(5﹣2x2﹣7x).
解:2(3x2﹣2x+1)﹣(5﹣2x2﹣7x),
=6x2﹣4x+2﹣5+2x2+7x,
=(6+2)x2+(7﹣4)x﹣5+2,
=8x2+3x﹣3.