5÷[(35%-)×]+
×2.75+0.125×+12.5%
(362+548×361)÷(362×548-186)
×+×+×+…+×.
网友回答
解:(1)5÷[(35%-)×]+,
=5÷[(-)×]+,
=5÷[(-)×]+,
=5÷[×]+,
=5÷,
=25+,
=25;
(2)×2.75+0.125×+12.5%,
=0.125×2.75+0.125×4.25+0.125,
=(2.75+4.25+1)×0.125,
=8×0.125,
=1;
(3)(362+548×361)÷(362×548-186),
=[362+548×(362-1)]÷(362×548-186),
=[362-548+548×362]÷(362×548-186),
=(362×548-186)÷(362×548-186),
=1;
(4)×+×+×+…+×,
=×(1-)+×(-)+×(-)+…+×(-),
=×(1-+-+-+…+-),
=×(1-),
=.
解析分析:(1)按运算顺序计算,先算小括号里的,再算中括号里的,最后算括号外的;(2)根据数字特点,把分数化为小数,然后用乘法分配律的逆运算简算;(3)此题如果直接计算,会较麻烦,所以要寻找简便的算法.前后两个括号内的数字有一定特点,通过变形,前后两个括号内的算式相同,故