用简便方法计算,要写出必要的计算过程
7.32-(3.8+1.32)
0.6×24+×76
×÷()
[7+(3-1)]×+.
网友回答
解:(1)7.32-(3.8+1.32),
=7.32-3.8-1.32,
=(7.32-1.32)-3.8,
=6-3.8,
=2.2;
(2)0.6×24+×76,
=0.6×24+0.6×76,
=(24+76)×0.6,
=100×0.6,
=60;
(3)×÷(),
=÷,
=×,
=;
(4)[7+(3-1)]×+,
=[7+]×+,
=×+3,
=4+3,
=(4+3)+(+),
=7+,
=7.
解析分析:(1)去括号,运用加法交换律与结合律简算;(2)把分数化为小数,运用乘法分配律简算;(3)先算×和括号内的,再算括号外的除法;(4)先算小括号内的,再算中括号内的,然后算括号外的乘法,最后算加法.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.