问题
选择题
若2x2+x+2与M的和为x,则M等于( )
A.2x2-2
B.2x2+2
C.-2x2+2
D.-2x2-2
答案
根据题意得:
M=x-(2x2+x+2)
=x-2x2-x-2
=-2x2-2.
故选D.
若2x2+x+2与M的和为x,则M等于( )
A.2x2-2
B.2x2+2
C.-2x2+2
D.-2x2-2
根据题意得:
M=x-(2x2+x+2)
=x-2x2-x-2
=-2x2-2.
故选D.