Question

(8加9分之4)除以4怎么简便?16分之7乘9减16分之7乘7怎么简便?

Answer 1

（8+4/9）/4

= 8÷4 + 4/9 ÷4

=2+1/9

=19/9

7/16 × 9 - 7/16 × 7

=7/16 ×（9-7）

=7/16 × 2

=7/8