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脱式计算.2.56-0.65+12.993.519÷1.7×0.85(6.25+79×6.25)÷0.5[13.7-(4.6+5.6)]×1.6.

题目详情
脱式计算.
2.56-0.65+12.99
3.519÷1.7×0.85
(6.25+79×6.25)÷0.5
[13.7-(4.6+5.6)]×1.6.




▼优质解答
答案和解析
(1)2.56-0.65+12.99
=1.91+12.99
=14.9;

(2)3.519÷1.7×0.85
=2.07×0.85
=1.7595;

(3)(6.25+79×6.25)÷0.5
=6.25×(79+1)÷0.5
=6.25×80÷0.5
=500÷0.5
=1000;

(4)[13.7-(4.6+5.6)]×1.6
=[13.7-10.2]×1.6
=3.5×1.6
=5.6.