下面各题,怎样算简便就怎样算. 2007+2007×99 1.5×[0.02÷(2.1-2.09)] 1/4×125×1/125×8 21×1/8+48×12.5%+11×1/8.

问题描述:

下面各题,怎样算简便就怎样算.
2007+2007×99
1.5×[0.02÷(2.1-2.09)]

1
4
×125×
1
125
×8
21×
1
8
+48×12.5%+11×
1
8

(1)2007+2007×99,
=2007×(1+99),
=2007×100,
=200700;
(2)1.5×[0.02÷(2.1-2.09)],
=1.5×[0.02÷0.01],
=1.5×2,
=3;
(3)

1
4
×125×
1
125
×8,
=(
1
4
×8)×(125×
1
125
),
=2×1,
=2;
(4)21×
1
8
+48×12.5%+11×
1
8

=
1
8
×(21+48+11),
=
1
8
×80,
=10.