题目内容

用简便方法计算.
①54.38+(19.5-4.38)
②25×32×7
③8×
3
5
+8×
2
5
+8
③756+199.
①54.38+(19.5-4.38),
=54.38+19.5-4.38,
=(54.38-4.38)+19.5,
=50+19.5,
=69.5;

②25×32×7,
=25×4×8×7,
=(25×4)×(8×7),
=100×56,
=5600;

③8×
3
5
+8×
2
5
+8,
=(
3
5
+
2
5
+1)×8,
=2×8,
=16;

④756+199,
=700+56+(200-1),
=700+200+(56-1),
=900+55,
=955.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网