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计算下列各题(能简算的要简算)(23+215)×45 313×25+1013×
问题详情
计算下列各题(能简算的要简算) (1)(23+215)×45,
(2 3+ 2 15)×45 3 13× 2 5+ 10 13×0.8-0.8
0.25×5 8×4×1.6
(11 2+2.25)÷〔(3 1 3-1 1 2)÷1 2 9〕
参考答案
=23×45+215×45,
=30+6,
=36;
(2)313×25+1013×0.8-0.8,
=313×25+1013×2×25-2×25,
=25×(313+2013-2),
=25×(-313),
=-665;
(3)0.25×58×4×1.6,
=(0.25×4)×(58×1.6),
=1×1,
=1;
(4)(112+2.25)÷[(313-112)÷129],
=(1.5+2.25)÷[116×911],
=3.75÷32,
=3.75×23,
=2.5.考点: