问题 填空题
(1)
y
x
=
()
x2
;______
(2)
a+b
ab
=
()
a2b
;______
(3)
x2+xy
x2
=
x+y
()
.______.
答案

(1)

y
x
=
xy
x2

(2)

a+b
ab
=
a2+ab
a2b

(3)

x2+xy
x2
=
x+y
x

故答案为:

xy
x2
a2+ab
a2b
x+y
x

问答题
单项选择题