Question

1.若单项式4Xm³-2MX²与2X²+3相加后是关于X的二次三项式,则M=（ ）.

Answer 1

1.(2-2M)X²+4XM³+3

2-2M≠0 M≠1

4M³≠0 M≠0

M≠0,1

2.M+(M+1)+(M+2)+...+(M+N)

=MN+(1+2+...+N)

=MN+(N+1)N/2

3.13X²-8X+(5-M)

M=5