用递等式计算.(怎样简便就怎样算) 725-625÷25 1823÷85+1823×38 4×0.8×2.5×12.5 12?34×2021?27 821÷[67×(512?14)].
(1)725-625÷25,
=725-25,
=700;
(2)
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
(3)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(4)12-
×
-
,
=12-
-
,
=12-(
+
),
=12-1,
=11;
(5)
÷[
×(
?
)],
=
÷[
×
],
=
÷
,
=
.
=725-25,
=700;
(2)
18 |
23 |
8 |
5 |
18 |
23 |
3 |
8 |
=
18 |
23 |
5 |
8 |
18 |
23 |
3 |
8 |
=
18 |
23 |
5 |
8 |
3 |
8 |
=
18 |
23 |
=
18 |
23 |
(3)4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;
(4)12-
3 |
4 |
20 |
21 |
2 |
7 |
=12-
5 |
7 |
2 |
7 |
=12-(
5 |
7 |
2 |
7 |
=12-1,
=11;
(5)
8 |
21 |
6 |
7 |
5 |
12 |
1 |
4 |
=
8 |
21 |
6 |
7 |
1 |
6 |
=
8 |
21 |
1 |
7 |
=
8 |
3 |
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