问题
解答题
计算下面各题(能简算的要简算).
|
答案
(1)706×99+706,
=706×(99+1),
=706×100,
=70600;
(2)25×
×1 3
×2 5
,3 10
=(25×
)×(2 5
×3 10
),1 3
=10×
,1 10
=1;
(3)1.6+3.1+5.4+6.9,
=(1.6+5.4)+(6.9+3.1),
=7+10,
=17;
(4)(
-1 2
)×1 4
,2 5
=
×1 4
,2 5
=
.1 10