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)]
×125×1 4
×81 125
21×
+48×12.5%+11×1 8
. 1 8
答
(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)
×125×1 4
×8,1 125
=(
×8)×(125×1 4
),1 125
=2×1,
=2;
(4)21×
+48×12.5%+11×1 8
,1 8
=
×(21+48+11),1 8
=
×80,1 8
=10.