2/5 + 3/7=3/7………… 1/7 + 3/7 + 4/7=(1/7 + 3/7) + ……………=1/7 + (3/7 + …………. )=(1/7+ 4/7)+………….

2 bình luận về “2/5 + 3/7=3/7………… 1/7 + 3/7 + 4/7=(1/7 + 3/7) + ……………=1/7 + (3/7 + …………. )=(1/7+ 4/7)+………….”

1. color{red}{Nhóm2k11}

   color{green}{#Thucute2008!}

   2/5 + 3/7 = 3/7 + 2/5

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

   3/4 – 2/8 = 3/4 – 1/4 = 2/4 = 1/2

   16/18 – 5/9 = 8/9 – 5/9 = 3/9 = 1/3

   17/12 – 3/4 = 17/12 – 9/12 = 8/12 = 2/3

   5/3 – 4/5 = 25/15 – 12/15 = 13/15

   6/7 – 5/8 = 48/56 – 35/56 = 13/56

    

   Trả lời
2. 1. 3/7 + 2/5

   2. ( 1/7 + 3/7) + 4/7= 1/7 + (3/7 +4/7) =( 1/7 +4/7) +3/7

   3.3/4 -2/8 = 3/4 – 1/4 = 2/4 =1/2

   4. 16/18 -5/9 8/9 -5/9 =3/9=1/3

   5. 17/12 – 3/4 = 17/12 -9/12 = 8/12 = 2/3

   6. 5/3 -4/5= 25/15 -12/15 = 13/25

   7. 6/7 – 5/8 = 48/56 – 35/56= 13/56

    

   Trả lời