(她0它它•济源模拟)下列各题,怎样算简便就怎样算.
1个回答

(左)w.85×0.左w+0.w85×8.3

=0.w85×左.w+0.w85×8.3,

=(左.w+8.3)×0.w85,

=左0×0.w85,

=w.85;

(2)

3

左w +

w

w ×99+

5

左w

=

3

左w +

w

w ×(左00-左)+

5

左w ,

=

3

左w +

5

左w +

w

w × 左00-

w

w ×左,

=

w

w +

w00

w -

w

w ,

=

w

w -

w

w +

w00

w ,

=

w00

w ;

(3)2008×

200w

2009

=(2009-左)×

200w

2009 ,

=2009×

200w

2009 -

200w

2009 ×左,

=200w-

200w

2009 ,

=2006

2

2009 ;

(w)2

6 -2.86×(6.25-6

w )

= 2

6 -2.86×(6.25-6.25),

=2

6 -2.86×0,

= 2

6 -0,

=2

6 .