Tính 3/16 x 2/7 + 6/32 x -12/7, 7/8 : ( -5/6 + 1/9 ) + 7/8 : ( 3 + -2/5 ), 8/5 x 45/17 x (-25/16) x ( -34/9 )

a . 3/16 x 2/7 + 6/32 x -12/7 b. 7/8 : ( -5/6 + 1/9 ) + 7/8 : ( 3 + -2/5 ) c. 8/5 x 45/17 x (-25/16) x ( -34/9 )