1,tính a,1/2+1/3+1/4 b,6/5+4/3+9/7 c,2/3+3/4+9/7 d,6/7+4/5+8/9

0 bình luận về “1,tính a,1/2+1/3+1/4 b,6/5+4/3+9/7 c,2/3+3/4+9/7 d,6/7+4/5+8/9”

1. Đáp án:a,13/12;b,401/105;c,227/84;d,802/315

    

   Giải thích các bước giải:

    a,1/2+1/3+1/4=6/12+4/12+3/12=13/12

   b,6/5+4/3+9/7=126/105+140/105+135/105=401/105

   c,2/3+3/4+9/7=56/84+63/84+108/84=227/84

   d,6/7+4/5+8/9=270/315+252/315+280/315=802/315

   Trả lời

2. `a, 1/2 + 1/3 + 1/4`

   `= (6 + 4 + 3)/12`

   `= 13/12`

    

   `b, 6/5 + 4/3 + 9/7`

   `= (126 + 140 + 135)/105`

   `= 401/105`

    

   `c, 2/3 + 3/4 + 9/7`

   `= (56 + 63 + 108)/84`

   `= 227/84`

    

   `d, 6/7 + 4/5 + 8/9`

   `= (270 + 252 + 280)/315`

   `= 802/315`

   Trả lời