分析:(1)先算乘法,再算减法,最后算加法;
(2)先算小括号里面的减法,再算中括号里面的乘法,然后算中括号里面的减法,最后算括号外的乘法;
(3)先算小括号里面的减法,再同时运算括号外的乘法和乘法,最后算括号外的加法;
(4)先算小括号里面的除法,再算小括号里面的减法,最后算括号外的乘法.
解答:解:(1)4035-53×26+1718,
=4035-1378+1718,
=2657+1718,
=4375;
(2)[(8.1-5.6)×0.9-1]×0.4,
=[2.5×0.9-1]×0.4,
=[2.25-1]×0.4,
=1.25×0.4,
=0.5;
(3)100÷(2.4-1
)+2.25×0.24,
=100÷1+2.25×0.24,
=100+0.54,
=100.54;
(4)5.6×(12.5-8.5÷0.85),
=5.6×(12.5-10),
=5.6×2.5,
=14.
点评:四则混合运算的顺序:1、如果是同一级运算,一般按从左往右依次进行计算;2、如果既有加减、又有乘除法,先算乘除法、再算加减;3、如果有括号,先算括号里面的.