Question

计算与化简：（1）?(13)?1+(?2)2×(?1)0?|?(23)2|（2）x?32x?4÷(x+2?5x?2)

计算与化简：（1）?(13)?1+(?2)2×(?1)0?|?(23)2|（2）x?32x?4÷(x+2?5x?2)．

Answer 1

（1）?(

1

3

)?1+(?2)2×(?1)0?|?

( 2 3 )2

|
=-

1

1 3

+4×1-|-

2

3

|
=-3+4-

2

3

=1-

2

3

=

1

3

；

（2）原式=

x?3

2(x?2)

÷(

(x+2)(x?2)

x?2

?

5

x?2

)
=

x?3

2(x?2)

÷

x2?9

x?2

=

x?3

2(x?2)

×

x?2

(x+3)(x?3)

=

1

2(x+3)

．