口算．16×8435×58（19+16）×36（19+34）×9．

Question

口算． (1)/(6) ×84

(3)/(5) × (5)/(8)

（ (1)/(9) + (1)/(6) ）×36

（ (1)/(9) + (3)/(4) ）×9．

Answer 1

口算，

(1)/(6) ×84=14

(3)/(5) × (5)/(8) = (3)/(8)

（ (1)/(9) + (1)/(6) ）×36=10

（ (1)/(9) + (3)/(4) ）×9=7 (3)/(4) ．