精英家教网 > 小学数学 > 题目详情
1944-5670×12÷70 
3.25×1.6-11.25÷4.5
87.25-(3.47-12.75)-6.53
2.4×3.9+2.4×5.1+1.2×2
(1.026÷5.7+8.4)×0.5
[36.4-(4.2-0.6)×5.5]÷0.01.
分析:(1)可根据乘法交换律计算;
(2)先算乘法与除法,再算减法;
(3)可根据一个数减两个数的差,等于减去两个数中的被减数加上减数,及一个数减两个数,等于减去这两个数的和的减法性质计算;
(4)可根据乘法分配律计算;
(5)(6)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)1944-5670×12÷70 
=1944-5670÷70×12,
=1944-81×12,
=1944-972,
=972;

(2)3.25×1.6-11.25÷4.5
=5.2-2.5,
=2.7;

(3)87.25-(3.47-12.75)-6.53
=87.25-3.47+12.75-6.53,
=87.25+12.75-(3.47+6.53),
=100-10,
=90;

(4)2.4×3.9+2.4×5.1+1.2×2
=(3.9+5.1)×2.4+2.4,
=9×2.4+2.4,
=(9+1)×2.4,
=10×2.4,
=24;

(5)(1.026÷5.7+8.4)×0.5
=(0.18+8.4)×0.5,
=8.58×0.5,
=4.29;

(6)[36.4-(4.2-0.6)×5.5]÷0.01
=(36.4-3.6×5.5)÷0.01,
=(36.4-19.8)÷0.01,
=16.6÷0.01,
=1660.
点评:完成本题要注意分析式中数据,然后运用合适的方法计算.
练习册系列答案
相关习题

同步练习册答案