题目下列化简正确的是（ ）A.2x+3y=5xy2x+3y=5xy2x+3y=5xyB.6x2−(−x2)=7x26x^{2}-(-x^{2})=7x^{2}6x2−(−x2)=7x2C.4ab−3ab=14ab-3ab=14ab−3ab=1D.a−2(b−c)=a−2b+ca-2\left(b-c\right)=a-2b+ca−2(b−c)=a−2b+c知识点：因式分解章节：数学竞赛 / 数与式
