问题 解答题
神机妙算:(怎样简便就怎样算)
4+16÷
4
5
5
14
÷
5
9
×64-1
5
9
×[
3
4
-(
7
16
-
1
4
)]
3
4
×0.53+75%×1.47
25×3.2×1.2530
5
14
÷
15
14
答案

(1)4+16÷

4
5

=4+16×

5
4

=4+20,

=24;

(2)

5
14
÷
5
9
×64-1,

=

5
14
×
9
5
×64-1,

=

288
7
-1,

=

281
7

(3)

5
9
×[
3
4
-(
7
16
-
1
4
)],

=

5
9
×[
3
4
+
1
4
-
7
16
],

=

5
9
×[1-
7
16
],

=

5
9
×
9
16

=

5
16

(4)

3
4
×0.53+75%×1.47,

=0.75×0.53+0.75×1.47,

=(0.53+1.47)×0.75,

=2×0.75,

=1.5;

(5)25×3.2×1.25,

=25×0.4×8×1.25,

=10×(8×1.25),

=10×10,

=100;

(6)30

5
14
÷
15
14

=(30+

5
14
)×
14
15

=30×

14
15
+
5
14
×
14
15

=28+

1
3

=28

1
3

单项选择题
单项选择题