(1)
(2)
(3)35.79×37+35.79×82-357.9×1.9
(4).
网友回答
解:(1)÷(+×5),
=÷(+1),
=÷,
=×,
=;
(2)×-÷1.25,
=×-÷,
=×-×,
=(-)×,
=×,
=;
(3)35.79×37+35.79×82-357.9×1.9,
=35.79×37+35.79×82-35.79×19,
=35.79×(37+82-19),
=35.79×100,
=3579;
(4)[(0.875-)×0.25]÷,
=[(-)×]÷,
=[×]÷,
=××,
=.
解析分析:(1)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(2)把小数化为分数,把除法变为乘法,运用乘法分配律简算;
(3)根据数字特点,通过数字转化,运用乘法分配律简算;
(4)把小数化为分数,先算小括号内的,原式变为××,约分计算.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.