解题思路:(1)先算除法,再算减法,
(2)先算小括号里的除法,再算括号外的乘法,
(3)运用乘法的交换律、结合律进行简算,
(4)先算小括号里的运算,再算乘法,
(5)先算小括号里的加法,再算中括号里的减法,最后算除法.
(1)201-5406÷51,
=201-106,
=95;
(2)1.8×(21÷1.4),
=1.8×15,
=27;
(3)3-4×2.33×0.25,
=3-(4×0.25)×2.33,
=3-1×2.33,
=3-2.33,
=0.67;
(4)([7/8]-[5/16])×([5/9]+[2/3]),
=[9/16]×[11/9],
=[11/16];
(5)[7/4]÷[[5/6]-(0.15+[9/20])],
=[7/4]÷[[5/6]-0.6],
=[7/4]÷[7/30],
=7.5.
点评:
本题考点: 整数四则混合运算;运算定律与简便运算;小数四则混合运算;整数、分数、小数、百分数四则混合运算.
考点点评: 考查了四则混合运算的运算顺序,注意有括号的运算.