解题思路:(1)先算乘法,再算减法;
(2)运用乘法分配律简算;
(3)(6)运用加法结合律简算;
(4)(5)根据减法的性质简算.
(1)267-67×3,
=267-201,
=66;
(2)87×99+87,
=87×(99+1),
=87×100,
=8700;
(3)1.27+3.9+0.73+16.1,
=(1.27+0.73)+(3.9+16.1),
=2+20,
=22;
(4)15.17-6.8-3.2,
=15.17-(6.8+3.2),
=15.17-10,
=5.17;
(5)12.75-(6.8+2.75),
=12.75-6.8-2.75,
=12.75-2.75-6.8,
=10-6.8,
=3.2;
(6)3.25+1.83-0.25+4.17,
=(3.25-0.25)+(1.83+4.17),
=3+6,
=9.
点评:
本题考点: 整数四则混合运算;运算定律与简便运算.
考点点评: 此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.