题目内容
用自己喜欢的方法计算. (265-190)×(138÷6) |
38×72-28×72 |
600-400÷25×4 | 6500-105×6+50. |
分析:(1)同时运算小括号里面的减法和除法,再算括号外的乘法;
(2)运用乘法分配律简算;
(3)先算除法,再算乘法,最后算减法;
(4)先算乘法,再算减法,最后算加法.
(2)运用乘法分配律简算;
(3)先算除法,再算乘法,最后算减法;
(4)先算乘法,再算减法,最后算加法.
解答:解:(1)(265-190)×(138÷6)
=75×23
=1725;
(2)38×72-28×72
=(38-28)×72
=10×72
=720;
(3)600-400÷25×4
=600-16×4
=600-64
=536;
(4)6500-105×6+50
=6500-630+50
=5870+50
=5920.
=75×23
=1725;
(2)38×72-28×72
=(38-28)×72
=10×72
=720;
(3)600-400÷25×4
=600-16×4
=600-64
=536;
(4)6500-105×6+50
=6500-630+50
=5870+50
=5920.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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