1) (-3/7 x 1/4) x (-4) = ( -3/28 ) x (-4) = 3/72) (-21/5 x 13/10) x 10/13 = (-273/50) x 10/13 = -21/10
1) (-3/7 x 1/4) x (-4) = ( -3/28 ) x (-4) = 3/7
2) (-21/5 x 13/10) x 10/13 = (-273/50) x 10/13 = -21/10