如题所述
第1个回答 2021-08-04
你好,根据你的题意,这道题应该这样做最简便
72×79
=72×(80-1)
=72×80-72×1
=72×80-72
=5760-72
=5688
以上仅供参考,希望能对你有所帮助
72×79
=72×(80-1)
=72×80-72×1
=72×80-72
=5760-72
=5688
以上仅供参考,希望能对你有所帮助
第2个回答 2021-08-05
这道题用简便方法运算的话,把79看成80,然后再用乘法分配律简便运算
72×79
=72×(80-1)
=5760-72
=5680
72×79
=72×(80-1)
=5760-72
=5680
第3个回答 2021-08-05
解:72X79
=72X(80一1)
=72X80一72X1
=5760一72=
=5688
=72X(80一1)
=72X80一72X1
=5760一72=
=5688
第4个回答 2021-08-04
解:
=72*(80-1)
=5760-72
=5688
=72*(80-1)
=5760-72
=5688
第5个回答 2021-08-05
72x79
=(72X80)一79
=5760一79
=5681
=(72X80)一79
=5760一79
=5681