能简算的要简算39.8÷2.5-112×3.6+5.5÷518-360%2010×200820091713-(911+1639×34)75÷[12×(34-13)]6.75÷512+42.5×0.24.-数学
题文
能简算的要简算 39.8÷2.5-
2010×
75÷[
6.75÷
|
答案
39.8÷2.5-
=15.92-5.5×3.6+5.5×3.6-3.6, =15.92+(5.5×3.6-5.5×3.6)-3.6, =15.92-3.6, =12.32; 2010×
=(2009+1)×
=2009×
=2008+
=2008
=
=
|