x3+2xy-x-xy2．
原式=x（x2+2y-1-y2）
=x[x2-（y2-2y+1）]
=x（x+y-1）（x-y+1）．
A client with type 1 (insulin-dependent) diabetes mellitus who is a multigravida visits the clinic at 28 weeks’ gestation. Which of the following instruction by the nurse is appropriate for the client
A. Nonstress testing is performed weekly until 32 weeks’ gestation.B. Weekly fetal movement counts are made by the mother.C. Contraction stress testing is performed weekly.D. Induction of labor is begun at 34 weeks’ gestation.
课堂上老师向同学们展示了《西周宗法制度示意表》，要求同学们依据表中信息去做些推论。有四位同学做出了如下四种推论，其中有违史实的是（ ）
A．宗法制度下统治阶级内部政治等级尊卑有序
B．用嫡长子继承制解决统治者的权力继承问题
C．西周宗法制下女性不享有各阶层的继承权
D．受封者在各自受封区域内享有土地所有权
