题目内容
计算.
18.2+0.68×0.4;
8.74÷(4.6×0.5);
3.2-3.7×0.6.
18.2+0.68×0.4;
8.74÷(4.6×0.5);
3.2-3.7×0.6.
分析:(1)先算乘法,再算加法;
(2)先算乘法,再算除法;
(3)先算乘法,再算减法.
(2)先算乘法,再算除法;
(3)先算乘法,再算减法.
解答:解:(1)18.2+0.68×0.4
=18.2+0.272
=18.472;
(2)8.74÷(4.6×0.5)
=8.74÷2.3
=3.8;
(3)3.2-3.7×0.6
=3.2-2.22
=0.98.
=18.2+0.272
=18.472;
(2)8.74÷(4.6×0.5)
=8.74÷2.3
=3.8;
(3)3.2-3.7×0.6
=3.2-2.22
=0.98.
点评:考查了小数四则混合运算,弄清运算顺序,然后再进一步计算.
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