1) 5 1/4 * 1 9/10 - 5 1/4 * 4 9/10 = 5 1/4 * ( 1 9/10 - 4 9/10 ) = 21/4 * ( - 3 ) =
= - 63/4 = - 15 3/4
2) 5 1/3 * 4 2/5 + ( - 5 1/3 ) * 2 1/5 - 5 1/3 * 1 1/5 = 5 1/3 * ( 4 2/5 - 2 1/5 - 1 1/5 ) = 5 1/3 * 1 = 5 1/3
1) 5 1/4 * 1 9/10 - 5 1/4 * 4 9/10 = 5 1/4 * ( 1 9/10 - 4 9/10 ) = 21/4 * ( - 3 ) =
= - 63/4 = - 15 3/4
2) 5 1/3 * 4 2/5 + ( - 5 1/3 ) * 2 1/5 - 5 1/3 * 1 1/5 = 5 1/3 * ( 4 2/5 - 2 1/5 - 1 1/5 ) = 5 1/3 * 1 = 5 1/3