解题思路:(1)运用加法交换律进行简便计算,
(2)运用乘法交换律进行简便计算,
(3)运用乘法分配律进行简便计算,
(4)运用加法交换律和加法结合律进行简便计算,
(5)先算括号里的,再算括号外面的,
(6)运用加法交换律进行简便计算.
(1)e.8+6.2+d.d,
=e.8+d.d+6.2,
=1d+6.2,
=16.2;
(d)d.2×3.8×4,
=d.2×4×3.8,
=1d×3.8,
=38;
(3)4.3×3.9+3.9×2.e,
=(4.3+2.e)×3.9,
=1d×3.9,
=39;
(4)[2/e]+[d/9]+[d/e]+[4/9],
=([2/e]+[d/e])+([d/9]+[4/9]),
=1+[d/3],
=1[d/3];
(2)[d/e]+([1/d]-[3/14]),
=[d/e+
d
e],
=[4/e];
(6)[4/12]+[2/8]+[11/12],
=[4/12]+[11/12]+[2/8],
=1+[2/8],
=1[2/8].
点评:
本题考点: 整数、分数、小数、百分数四则混合运算;运算定律与简便运算.
考点点评: 本题主要考查了学生在运算中能灵活运用运算定律,进行简便运算的能力.