a) (7/48 +13/24 -3/4) * 32/5 -16/5 *(13/5- 51/10)= (27/24- 36/48 ) *32/5 -16/5*
*(26/10-51/10)= 9/48 *32/5 -16/5* (-25/10)= 6/5 +8/5 =13/5
b) (-3/7)*14/11: 33/ 484-(-2)³-(-3 /2) ²: 9/ 4
= 6/11*33/484 + 8 +9/4 : 9/4=
= 9/242+8+1= 9/242+9=9/242+2178/242=2187/242