(1)÷÷(2)×6+(3)×÷(4)(-)÷(5)-×(6)(0.25+×)÷.
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解:(1)÷÷,
=21×,
=12;
(2)×6+,
=×(6+1),
=×7,
=5;
(3)×÷,
=××,
=××,
=4×,
=;
(4)(-)÷,
=(-)×56,
=×56-×56,
=42-40,
=2;
(5)-×,
=(1-)×,
=×,
=;
(6)(0.25+×)÷,
=(0.25+)÷,
=1,
=.
解析分析:(1)按照从左到右的顺序计算;
(2)(5)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法交换律简算;
(4)先把除法变成乘法,再运用乘法分配律简算;
(6)先算小括号里面的乘法,再算小括号里面的加法,最后算括号外的除法.
点评:此题主要考查分数的四则混合运算的运算顺序,以及应用运算定律进行简便计算的能力.