计算下面各题,能简算的要简算.
÷+÷
÷÷
(++)÷
÷[×(+)].
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解:
(1)÷+÷,
=×+×,
=(+)×,
=1×,
=;
(2)÷÷,
=÷,
=;
(3)(++)÷,
=(++)×12,
=×12+×12+×12,
=6+4+2,
=10+2,
=12;
(4)÷[×(+)],
=÷[×],
=÷,
=3.
解析分析:(1)根据乘法分配律进行简算;
(2)按照从左向右的顺序进行计算;
(3)根据乘法分配律进行简算;
(4)先算加法,再算乘法,最后算除法.
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.