题目内容

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
(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
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