解题思路:(1)运用减法的性质简算;
(2)(6)运用加法结合律简算;
(3)运用乘法结合律简算;
(4)(5)运用乘法分配律简算.
(1)245-65-35,
=245-(65+35),
=245-100,
=145;
(2)186+82+18,
=186+(82+18),
=186+100,
=286;
(3)25×(4×27),
=25×4×27,
=100×27,
=2700;
(4)8×(25+20),
=8×25+8×20,
=200+160,
=360;
(5)24×56+44×24,
=24×(56+44),
=24×100,
=2400;
(6)5.78+0.32+0.68,
=5.78+(0.32+0.68),
=5.78+1,
=6.78.
点评:
本题考点: 运算定律与简便运算;整数四则混合运算.
考点点评: 完成本题,注意分析式中数据,运用合适的简便方法计算.