( 1 + 1/2 - 1/4)  .  (2 + 3/7)

A= 50- 4/13 + 2/15 - 2/17 / 100- 8/13+ 4/15 -4/17

11/8 ×[( -5/11 : 13/8 - 5/11 : 13/5)+ -6/33]+ -3/4

A, (-1/3)× (15/19)×38/45 |b, (-5/9)×3/11+(13/18)×3/11 |c, (2/1× 9/17×3/32) : (-3/17)

146/13 -( 16/7 - 65/13)

-5/7 x 2/11 + -5/7 x 9/11 + 12/7

71/19 + 13/17 + 35/ 43 + 119/19 +8/43

2/7 rút gọn

A, 1/5 × 2/3 + 2/6 ×1/5 | B, 4/5 + 1/5 × -5/5 + 9/5 ×1/5 | C, 34/15 : 3/2 - 4/15 : 3/2 | D, 5/17 +12/5 × 4/17 + 12/17 × 1/5