题目内容
下面的计算对吗?请把错误的改过来.
1.25×(8+0.8)
=1.25×8+0.8
=10+0.8
=10.8
3.6+2.4×0.06
=6×0.06
=O.36
1.25×(8+0.8)
=1.25×8+0.8
=10+0.8
=10.8
×
×
3.6+2.4×0.06
=6×0.06
=O.36
×
×
.分析:(1)1.25分别去乘8与0.8,没有和0.8相乘,所以,错;然后再根据乘法分配律进行计算;
(2)先算乘法,再算加法,所以,错.
(2)先算乘法,再算加法,所以,错.
解答:解:
(1)×;
改正:
1.25×(8+0.8),
=1.25×8+1.25×0.8,
=10+1,
=11;
(2)×;
改正:
3.6+2.4×0.06,
=3.6+0.144,
=3.744.
(1)×;
改正:
1.25×(8+0.8),
=1.25×8+1.25×0.8,
=10+1,
=11;
(2)×;
改正:
3.6+2.4×0.06,
=3.6+0.144,
=3.744.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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