题目内容
脱式计算
3.25×4.7-7.8
0.57+0.43×0.24.
3.25×4.7-7.8
0.57+0.43×0.24.
分析:(1)先算乘法,再算减法;
(2)先算乘法,再算加法.
(2)先算乘法,再算加法.
解答:解:(1)3.25×4.7-7.8,
=15.275-7.8,
=7.475;
(2)0.57+0.43×0.24,
=0.57+0.1032,
=0.6732.
=15.275-7.8,
=7.475;
(2)0.57+0.43×0.24,
=0.57+0.1032,
=0.6732.
点评:一个算式里,如果含有两级运算,要先做第二级运算,后做第一级运算;注意这一运算的顺序,不要被数字迷惑.
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