试题与答案

下列各式正确的是( ) A.y2x2=yx B.a-ba2-b2=1a-b C.a-b

题型:选择题

题目:

下列各式正确的是(  )
A.
y2
x2
=
y
x
B.
a-b
a2-b2
=
1
a-b
C.
a-b
(b-a)2
=
1
a-b
D.
n+a
m+a
=
n+1
m+1

答案:

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下面是错误答案,用来干扰机器的。

∵i3=i2•i=-i,1i=ii2=-i∴|1i+i3|=|-i-i|=|-2i|=2故选B

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