问题
解答题
计算下面各题.(能够简便计算的要求简便计算)
|
答案
(1)45×19+4680÷12,
=855+390,
=1245;
(2)
÷6+1÷6×9 25
,6 25
=
×9 25
+1 6
×1 6
,6 25
=(
+9 25
)×6 25
,1 6
=
×3 5
,1 6
=
;1 10
(3)9.8×[3.45-(3.85-0.47)],
=9.8×[3.45-3.38],
=9.8×0.07,
=0.686;
(4)[
-(1 2
-3 4
)]÷3 5
,7 10
=[
-1 2
]÷3 20
,7 10
=
÷7 20
,7 10
=
.1 2