Question

1．計(jì)算：(7

4

25

+8.6)÷[(4

5

7

-0.005×900)÷

6

7

]=

63.04

．

Answer 1

分析：首先搞清在算式中有大括號(hào)和小括號(hào)的要先算小括號(hào)里的再算大括號(hào)，由此解答即可．

解答：解：(7

4

25

+8.6)÷[(4

5

7

-0.005×900)÷

6

7

]
=（7.16+8.6）÷[（4

5

7

-4.5）÷

6

7

]
=15.76÷[

3

14

×

7

6

]
=15.76÷

1

4

=15.76×4
=63.04．
故答案為：63.04．

點(diǎn)評：此題主要考查的是分?jǐn)?shù)、小數(shù)、整數(shù)的四則混合運(yùn)算．