能简算的要简算．15÷13+45×11334×25÷34×256-229+1792.5×32×12.5．

Question

能简算的要简算．

(1)/(5) ÷13+ (4)/(5) × (1)/(13)

(3)/(4) × (2)/(5) ÷ (3)/(4) × (2)/(5)

6-2 (2)/(9) +1 (7)/(9)

2.5×32×12.5．

Answer 1

① (1)/(5) ÷13+ (4)/(5) × (1)/(13) ，

= (1)/(5) × (1)/(13) + (4)/(5) × (1)/(13) ，
= (1)/(13) × （ (1)/(5) +(4)/(5) ），
= (1)/(13) ×1，
= (1)/(13) ；


② (3)/(4) × (2)/(5) ÷ (3)/(4) × (2)/(5) ，
= (3)/(4) × (2)/(5) × (4)/(3) × (2)/(5) ，
=（ (3)/(4) × (4)/(3) ）×（ (2)/(5) × (2)/(5) ），
= (4)/(25) ；

③6-2 (2)/(9) +1 (7)/(9) ，
=3 (7)/(9) +1 (7)/(9) ，
=5 (5)/(9) ；

④2.5×32×12.5，
=2.5×4×12.5×8，
=（2.5×4）×（12.5×8），
=10×100，
=1000；