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计算,能简算的要简算,并写出主要过程.306÷(201×47-9413)(2007×2009×(53.7×5.3+537×0.37+53.7.
题目详情
计算,能简算的要简算,并写出主要过程.
306÷(201×47-9413)
(
2007×2009×(
53.7×5.3+537×0.37+53.7
.
306÷(201×47-9413)
(
2007×2009×(
53.7×5.3+537×0.37+53.7
.
▼优质解答
答案和解析
(1)306÷(201×47-9413),
=306÷(9447-9413),
=306÷34,
=9;
(2)÷[(+)×],
=÷[×],
=÷,
=×15,
=3;
(3)×35+35×,
=(+)×35,
=1×35,
=35;
(4)2007×2009×(+),
=2007×2009×+2007×2009×,
=+,
=1++(1-),
=2;
(5)53.7×5.3+537×0.37+53.7,
=53.7×5.3+53.7×3.7+53.7,
=(5.3+3.7+1)×53.7,
=10×53.7,
=537;
(6)+++…+,
=2×(+++…+),
=2×(1-+-+-+…+-)
=2×(1-)
=2×
=.
=306÷(9447-9413),
=306÷34,
=9;
(2)÷[(+)×],
=÷[×],
=÷,
=×15,
=3;
(3)×35+35×,
=(+)×35,
=1×35,
=35;
(4)2007×2009×(+),
=2007×2009×+2007×2009×,
=+,
=1++(1-),
=2;
(5)53.7×5.3+537×0.37+53.7,
=53.7×5.3+53.7×3.7+53.7,
=(5.3+3.7+1)×53.7,
=10×53.7,
=537;
(6)+++…+,
=2×(+++…+),
=2×(1-+-+-+…+-)
=2×(1-)
=2×
=.
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