
用递等式计算,能简便的要用简便方法计算. 17÷23×5 625÷9+625×89 5×(13-15)÷512 48
用递等式计算,能简便的要用简便方法计算.17÷23×5625÷9+625×895×(13-15)÷51248×(13+14-12)...
用递等式计算,能简便的要用简便方法计算. 17÷23×5 625÷9+625×89 5×(13-15)÷512 48×(13+14-12)
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(1)
÷
×5,
=
×5,
=
;
(2)
÷9+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)5×(
-
)÷
,
=5×
÷
,
=
×
,
=
;
(4)48×(
+
-
),
=48×
+48×
-48×
,
=16+12-24,
=28-24,
=4.
1 |
7 |
2 |
3 |
=
3 |
14 |
=
15 |
14 |
(2)
6 |
25 |
6 |
25 |
8 |
9 |
=
6 |
25 |
1 |
9 |
6 |
25 |
8 |
9 |
=
6 |
25 |
1 |
9 |
8 |
9 |
=
6 |
25 |
=
6 |
25 |
(3)5×(
1 |
3 |
1 |
5 |
5 |
12 |
=5×
2 |
15 |
5 |
12 |
=
2 |
3 |
12 |
5 |
=
8 |
5 |
(4)48×(
1 |
3 |
1 |
4 |
1 |
2 |
=48×
1 |
3 |
1 |
4 |
1 |
2 |
=16+12-24,
=28-24,
=4.
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