(A) the application of fractional multiplication and multiplication distribution law
10/ 17× 1/4+ 10/ 17×3/4
= 10/ 17×( 1/4+3/4)
= 10/ 17× 1
= 10/ 17
(2) The mixed operation of fractional multiplication and division and the application of multiplication and division.
7/8÷7/4+7/8×3/7
=7/8×4/7+7/8×3/7
=7/8×(4/7+3/7)
=7/8× 1
=7/8