0.2x^2-0.3x+0.5-0.1x^2+0.7x-0.11怎么算?

问题描述:

0.2x^2-0.3x+0.5-0.1x^2+0.7x-0.11怎么算?

合并同类项
0.2x^2-0.3x+0.5-0.1x^2+0.7x-0.11
=0.1x^2+0.4x+0.39