12*29+72简便运算怎么做?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 21:33:06
![12*29+72简便运算怎么做?](/uploads/image/z/1743264-0-4.jpg?t=12%2A29%2B72%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E6%80%8E%E4%B9%88%E5%81%9A%3F)
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12*29+72简便运算怎么做?
12*29+72简便运算怎么做?
12*29+72简便运算怎么做?
12×29+72
=12×(30 - 1) +72
= 12×30 -12+72
=360 +(72 - 12)
=360 + 60
=420
12*(29+6)=12*35=12*5*7=420