下面各题怎样算简便就怎样算.(1)1714+13×23(2)4×4.9×25(3)1014-(614-215)(4)7.6×99(5)(56+78-512)÷124(6)(1.75×0.2+1.75×0.8)÷0.175.
下面各题怎样算简便就怎样算.
(1)1714+13×23 (2)4×4.9×25 (3)10-(6-2)
(4)7.6×99 (5)(+-)÷ (6)(1.75×0.2+1.75×0.8)÷0.175.
答案和解析
(1)1714+13×23
=1714+299
=2013;
(2)4×4.9×25
=4×25×4.9
=100×4.9
=490;
(3)10
-(6-2)
=10-6+2
=4+2
=6;
(4)7.6×99
=7.6×(100-1)
=7.6×100-7.6×1
=760-7.6
=752.4;
(5)(+-)÷
=(+-)×24
=×24+×24-×24
=20+21-10
=41-10
=31;
(6)(1.75×0.2+1.75×0.8)÷0.175
=1.75×(0.2+0.8)÷0.175
=1.75×1÷0.175
=1.75÷0.175
=10.
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