怎样简便算,我会好评的.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/19 06:57:25
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怎样简便算,我会好评的.
怎样简便算,我会好评的.
怎样简便算,我会好评的.
9999×9999+19999=9999×9999+10000+9999=9999×(9999+1)+10000=10000×(9999+1)=10000×10000=100000000
666×333+778×999=333×(666+778×3)=333×{3×(222+778)}=333×(3×1000)=333×3000=999000
9999×9999+19999=9999×9999+10000+9999=9999×(9999+1)+10000=10000×(9999+1)=10000×10000=100000000
666×333+778×999=333×(666+778×3)=333×{3×(222+778)}=333×(3×1000)=333×3000=999000