19999簡(jiǎn)便運(yùn)算怎么算?
9999×9999+19999=9999x9999+10000+9999=9999x(9999+1)+10000=9999x10000+10000=10000x(9999+1)=10000x10000=100000000
19999簡(jiǎn)便運(yùn)算怎么算?
9999×9999+19999=9999x9999+10000+9999=9999x(9999+1)+10000=9999x10000+10000=10000x(9999+1)=10000x10000=100000000