问题 解答题
用简便方法计算.
0.25×64×1.25      
17×
2
3
÷
2
3
×17.
答案

(1)0.25×64×1.25,

=0.25×4×2×8×1.25,

=(0.25×4)×(8×1.25)×2,

=1×10×2,

=10×2,

=20;

(2)17×

2
3
÷
2
3
×17,

=17×

2
3
×
3
2
×17,

=(

2
3
×
3
2
)×(17×17),

=1×289,

=289.

单项选择题
单项选择题 A1型题