简算. ×3+×5+×10999×7+111×797×(+++)×20028.5×+0.75×5+6.5÷1++++.
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解:(1)×3+×5+×10,
=×(3+5+10),
=×18,
=5;(2)999×7+111×7,
=7×(999+111),
=7×1110,
=7770,
(3)97×,
=(96+1)×,
=96×+1×,
=5+,
=5;
(4)(+++)×2002,
=×2002+×2002+×2002+×2002;
=1001+286+182+154,
=1623;
(5)8.5×+0.75×5+6.5÷1,
=8.5×+×5+6.5×,
=×(8.5+5+6.5),
=×20,
=15;
(6)++++,
=+++++++++-1,
=1+10+100+1000+10000-1,
=11110.
解析分析:(1)、(2)、(3)、(4)利用乘法的分配律解答;(5)把8.5×+0.75×5+6.5÷1转化为8.5×+×5+6.5×,再利用乘法的分配律解答;(6)将给出的式子加5个,再减去1即可.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.