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)4

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=

x2?4x+4

x2?2x+1

?

x?1

x2?4

÷

x?2

2x+x2

=

(x?2)2

(x?1)2

?

x?1

(x+2)(x?2)

?

x(2+x)

x?2

=

x

x?1

；

（2）原式=

1?a?2

a+2

?

(a+2)(a?2)

(a+1)2

=

2?a

a+1

；

（3）原式=-a²b⁶?

b3

a6

?

a4

b4

=-b⁵．