解题思路:(1)根据乘法分配律进行简算;
(2)根据乘法交换律进行简算;
(3)先算加法,再算中括号里面的除法,再算减法,最后算括号外面的除法;
(4)先算小括号里面的减法,再算中括号里面的乘法,再算中括号里面的减法,最后算括号外面的乘法.
(1)5.4×5.08+3.6×5.08+5.08
=(5.4+3.6+1)×5.08
=10×5.08
=50.8;
(2)0.25×588.5×400
=0.25×400×588.5
=100×588.5
=58850;
(3)[10.31-(4.86+1.03)÷1.9]÷0.125
=[10.31-5.89÷1.9]÷0.125
=[10.31-3.1]÷0.125
=7.21÷0.125
=57.68;
(4)[(6.1-4.6)×0.8-1]×0.4
=[1.5×0.8-1]×0.4
=[1.2-1]×0.4
=0.2×0.4
=0.08.
点评:
本题考点: 小数四则混合运算;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.