递等式计算.(能简算的要简算)19.67-(1.67+229)-179(4-3.6×23)÷451118×27+117×5183.5×45+5.5×80%+0.86.4×1.25×2.52008÷2009×2010.
递等式计算.(能简算的要简算)
19.67-(1.67+2)-1
(4-3.6×)÷
×+×
3.5×+5.5×80%+0.8
6.4×1.25×2.5
2008÷2009×2010.
答案和解析
(1)19.67-(1.67+2
)-1,
=19.67-1.67-2-1,
=(19.67-1.67)-(2+1),
=18-4,
=14;
(2)(4-3.6×)÷,
=(4-2.4)÷,
=1.6÷,
=2;
(3)×+×,
=×+×,
=×(+),
=;
(4)3.5×+5.5×80%+0.8,
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;
(5)6.4×1.25×2.5,
=(8×0.8)×1.25×2.5,
=(8×1.25)×(8×2.5),
=10×20,
=200;
(6)2008÷2009×2010,
=×2010,
=×(2009+1),
=×2009+×1,
=2008+,
=2008.
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