填空题若，则f(x)的间断点是________．

填空题曲线y=x3-3x2+2x+1的拐点是______．

填空题设连续函数f(x)，f(0)=0，，Ωt：x2+y2≤t2，0≤z≤1，则

填空题任意3维向量都可用α 1 ＝(1，0，1) T ，α 2 ＝(1，－2，3) T ，α 3 ＝(a，1，2) T 线性表出，则a_______．

填空题设A是4×3矩阵，且A的秩r(A)=2，而，则r(AB)=________．

填空题设z=f(x2+y2)，则______。

填空题 The influence of the moral standards of the home is evident. If there is' no recognition of the difference {{U}}{{U}} 1 {{/U}} {{/U}}right and wrong, it is hard for the child to acquire the qualities which are necessary {{U}} {{U}} 2 {{/U}} {{/U}}good citizenship. Unwise discipline is, almost equally obvious, {{U}} {{U}} 3 {{/U}} {{/U}}factor often found in the background of the young offender. But important {{U}} {{U}} 4 {{/U}} {{/U}}these two factors are, they do not cover the whole field. The experience of those who work with juvenile delinquents has shown us {{U}} {{U}} 5 {{/U}} {{/U}}greatly behavior is influenced by the emotional relationships within the family circle. The extent to which {{U}} {{U}} 6 {{/U}} {{/U}}is affection between the {{U}} {{U}} 7 {{/U}} {{/U}}and the child, and in the early stages especially between the mother and the child, is evidently of fundamental {{U}} {{U}} 8 {{/U}} {{/U}}to his development. Lack of love is more {{U}} {{U}} 9 {{/U}} {{/U}}to produce delinquency {{U}} {{U}} 10 {{/U}} {{/U}}bad material conditions.

填空题函数的连续区间为________．

填空题从R2的基α1＝，α2＝到基β1＝，β2＝的过渡矩阵为________．