46.3-19.9怎麼簡算

46.3-19.9怎麼簡算


46.3-19.9
=46.3-(20-0.1)
=46.3-20+0.1
=26.3+0.1
=26.4
如果本題有什麼不明白可以追問,



(12/5+19/1)×12+19/7這題怎麼簡算?


(12/5+19/1)×12+19/7 =12/5×12+19/1×12+19/7 =5+19/12+19/7 =5+1 =6



5/19加2 /7加12/19加5/7要簡算


5/19+2/7+12/19+5/7
=(5/19+12/19)+(2/7+5/7)
=1+1
=2