Question

1

1

3

-(2

1

2

-

2

3

)+(-1

2

3

+1

1

2

)．

Answer 1

分析：先去括號(hào)，再計(jì)算同分母分?jǐn)?shù)，再相加即可．

解答：解：1

1

3

-(2

1

2

-

2

3

)+(-1

2

3

+1

1

2

)
=1

1

3

-2

1

2

+

2

3

-1

2

3

+1

1

2

=1

1

3

+

2

3

-1

2

3

-2

1

2

+1

1

2

=

1

3

-1
=-

2

3

．

點(diǎn)評(píng)：考查了有理數(shù)的加減混合運(yùn)算，轉(zhuǎn)化成省略括號(hào)的代數(shù)和的形式，就可以應(yīng)用加法的運(yùn)算律，使計(jì)算簡(jiǎn)化．