45*44⼀43怎么算?

2025-02-27 06:53:58
推荐回答(1个)
回答1:

45*(43/44)=45*43/44=[(44+1)*(44-1)]/44 因为(a+b)*(a-b)=a^2-b^2 所以(44^2-1)/44=[44(44-1/44)]/44=44-1/44