Question

计算：（1）x2?4x+4x2?2x+1?x?1x2?4÷x?22x+x2；（2）(1a+2?1)÷a2+2a+1a2?4；（3）(ab3)2?(?ba2)3÷(ba)

计算：（1）x2?4x+4x2?2x+1?x?1x2?4÷x?22x+x2；（2）(1a+2?1)÷a2+2a+1a2?4；（3）(ab3)2?(?ba2)3÷(ba)4．

Answer 1

（1）原式=

(x?2)2

(x?1)2

?

x?1

(x+2)(x?2)

÷

x?2

x(x+2)

=

(x?2)2

(x?1)2

?

x?1

(x+2)(x?2)

?

x(x+2)

x?2

=

x

x?1

；
（2）原式=

a+1

a+2

÷

(a+1)2

(a+2)(a?2)

=

a+1

a+2

?

(a+2)(a?2)

(a+1)2

=

a?2

a+1

；
（3）原式=-a²b⁶?

b3

a6

÷

b4

a4

=-=-a²b⁶?

b3

a6

?

a4

b4

=-b⁵．