题目内容
脱式计算.
7×(625-387)
200-40×3
405×3-600.
7×(625-387)
200-40×3
405×3-600.
分析:(1)先算减法,再算乘法;
(2)(3)先算乘法,再算减法.
(2)(3)先算乘法,再算减法.
解答:解:(1)7×(625-387)
=7×238
=1666;
(2)200-40×3
=200-120
=80;
(3)405×3-600
=1215-600
=615.
=7×238
=1666;
(2)200-40×3
=200-120
=80;
(3)405×3-600
=1215-600
=615.
点评:混合运算抓住运算顺序,正确按运算顺序计算即可.
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