解题思路:(1)根据乘法交换律进行计算;
(2)根据乘法结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据乘法结合律进行计算.
(1)[5/6]×[7/25]×6,
=[5/6]×6×[7/25],
=5×[7/25],
=[7/5];
(2)[2/5]×[3/14]×[2/3],
=[2/5]×([3/14]×[2/3]),
=[2/5]×[1/7],
=[2/35];
(3)([3/7]+[1/2])×14,
=[3/7]×14+[1/2]×14,
=6+7,
=13;
(4)[5/8]×[5/8]+[5/8]×[3/8],
=[5/8]×([5/8]+[3/8]),
=[5/8]×1,
=[5/8];
(5)100×[2/99],
=(99+1)×[2/99],
=99×
点评:
本题考点: 分数的简便计算.
考点点评: 四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.