1:若(X^2+NX+3)(X^2-3X-M)乘积中不含X^2,与X^3项,求M与N
(X^2+NX+3)(X^2-3X-M)
=X^4+(N-3)X^3+(3-M-3N)X^2-(MN+9)X-3M
N-3=0
3-M-3N=0
M=-6
N=3
2:1^2-2^2+3^2-4^2+```````````+99^2-100^2
=(1-2)(1+2)+(3-4)(3+4)+……+(99-100)(99+100)
=-1-2-3-4-……-99-100
=(-1-100)*100/2
=-5050
3:若4A^2+B^2+4A+6B+10=0,求A+B
4A^2+B^2+4A+6B+10=0
4A^2+4A+1+B^2+6B+9=0
(2A+1)^2+(B+3)^2=0
2A+1=0,B+3=0
A=-1/2
B=-3
A+B=-3.5
4:若A是一个单项式,9X^2+1+A是一个整式的平方,求A
9X^2+1+A=(3X+1)^2-6X+A
A-6X=0
A=6x
xiexie
xiexie
:若(X^2+NX+3)(X^2-3X-M)乘积中不含X^2,与X^3项,求M与N
2:1^2-2^2+3^2-4^2+```````````+99^2-100^2
3:若4A^2+B^2+4A+6B+10=0,求A+B
4:若A是一个单项式,9X^2+1+A是一个整式的平方,求A
:若(X^2+NX+3)(X^2-3X-M)乘积中不含X^2,与X^3项,求M与N
2:1^2-2^2+3^2-4^2+```````````+99^2-100^2
3:若4A^2+B^2+4A+6B+10=0,求A+B
4:若A是一个单项式,9X^2+1+A是一个整式的平方,求A
数学人气:165 ℃时间:2020-05-19 01:55:49
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