解题思路:①用乘法结合律简算,其余题目用乘法分配律简算解答即可.
①4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
②2.3×85+2.3×15,
=2.3×(85+15),
=2.3×100,
=230;
③36.5×99+36.5,
=36.5×(99+1),
=36.5×100,
=3650;
④0.65×14+87×65%-[13/20],
=0.65×(14+87-1),
=0.65×100,
=65;
⑤([2/3]-[1/2]+[1/6])÷[1/24],
=([2/3]-[1/2]+[1/6])×24,
=[2/3]×24-[1/2]×24+
1
6×24,
=16-12+4,
=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;分数的简便计算.
考点点评: 本题是利用运算定律进行简算,记住运算定律,并灵活运用.