用递等式计算. (能简算的要简算)
×(÷)???????????+÷3.7×99+3.7+++360÷15+2.5×16????????÷〔1-(-)〕
网友回答
解:(1)×(÷),
=,
=;
(2)+÷,
=,
=2;
(3)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370;
(4)+++,
=()+(),
=1+1,
=2;
(5)360÷15+2.5×16,
=24+40,
=64;
(6)÷〔1-(-)〕,
=÷〔1-〕,
=÷,
=.
解析分析:(1)(2)(5)(6)依据四则运算顺序,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答,
(3)运用乘法分配律解答,
(4)运用加法交换律和结合律解答.
点评:本题主要考查学生依据四则运算顺序,以及简便方法正确解决问题的能力.