Question

直接写出得数．

5 6 × 5 6 =	3 7 × 7 3 =	2 5 ×5=	5 7 × 3 14 =
5 8 × 24 5 =	42×π=	22×π=	32π=

Answer 1

分析：①②③⑤约分计算；④分子相乘的积做分子，分母相乘的积做分母；⑥⑦⑧先算乘方，再算乘法（π取3.14）．

解答：解：①

5

6

×

5

6

=

25

36

；          ②

3

7

×

7

3

=1；           ③

2

5

×5=2；          ④

5

7

×

3

14

=

15

98

；
⑤

5

8

×

24

5

=3；               ⑥4²×π≈50.24；       ⑦2²×π=12.56；       ⑧3²π=28.26．

点评：此题考查了约分计算、乘方等知识，注意运算方法．