题目内容
用合适的方法计算下列各题: ×× | (1+)×12 |
×32+32× | ×÷ |
÷× | ×8+÷8. |
解:××
=,
=;
(1+)×12
=1×12+12,
=12+,
=12+4,
=16;
×32+32×
=(+)×32,
=1×32,
=32;
×÷
=,
=;
÷×
=×,
=×,
=;
×8+÷8
=+,
=3+,
=3.
分析:本题根据分数乘法、除法及四则混合运算的运算法则计算即可;
(1+)×12;×32+32×可根据乘法分配律进行计算.
点评:完成有关于分数的四则混合运算题目时要注意通分约分,和灵活运用运算定律简算.
=,
=;
(1+)×12
=1×12+12,
=12+,
=12+4,
=16;
×32+32×
=(+)×32,
=1×32,
=32;
×÷
=,
=;
÷×
=×,
=×,
=;
×8+÷8
=+,
=3+,
=3.
分析:本题根据分数乘法、除法及四则混合运算的运算法则计算即可;
(1+)×12;×32+32×可根据乘法分配律进行计算.
点评:完成有关于分数的四则混合运算题目时要注意通分约分,和灵活运用运算定律简算.
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