溪枫文库/教育专区【www.xfdocx.com】【巩固练习】一.选择题1．下列计算正确的是()．A.x23x5B.x35x15C.x4x5x20D.x32x62．a52a25的结果是()．A.0B.2a7C.2a10D.2a103．下列算式计算正确的是()．A.a33a33a6B.x2nx2nC.y23y6y6D.c333c333c274．x3n1可以写成()．A.x3n1B.xn31C.xx3nD.xn2n15．下列计算中，错误的个数是()．③(2x)38x3327①3...