解题思路:(1)根据加法交换律和结合律简便计算;
(2)根据连减的简便方法计算即可;
(3)先去括号,再从左往右计算;
(4)先变形为125×8×7,再进行计算;
(5)(6)根据乘法分配律简便计算.
(1)14.35+3.98+2.65
=14.35+2.65+3.98
=17+3.98
=20.98;
(2)12.5-8.14-1.86
=12.5-(8.14+1.86)
=12.5-10
=2.5;
(3)23.1-(12.1-2.46 )
=23.1-12.1+2.46
=11+2.46
=13.46;
(4)125×56
=125×8×7
=1000×7
=7000;
(5)56×75+44×75
=(56+44)×75
=100×75
=7500;
(6)101×43-43
=(101-1)×43
=100×43
=4300.
点评:
本题考点: 运算定律与简便运算.
考点点评: 考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.