tính nhanh A=1/5 + 4/7 + 1/4 +3/7 + 4/5 + 1/4= ?

2 bình luận về “tính nhanh A=1/5 + 4/7 + 1/4 +3/7 + 4/5 + 1/4= ?”

1. A=1/5+4/7+1/4+3/7+4/5+1/4

   A=(1/5+4/5)+(4/7+3/7)+(1/4+1/4)

   A=1+1+2/4

   A=10/4

   A=5/2

    

   Trả lời
2. A=1/5+4/7+1/4+3/7+4/5+1/4

   =(1/5+4/5)+(4/7+3/7)+(1/4+1/4)

   =5/5+7/7+2/4

   =1+1+1/2

   =2+1/2

   =5/2

   Trả lời