
脱式计算.(1)450÷18×25(2)13+23÷12(3)(56?23)×310(4)813÷7+17×613
脱式计算.(1)450÷18×25(2)13+23÷12(3)(56?23)×310(4)813÷7+17×613....
脱式计算.(1)450÷18×25(2)13+23÷12(3)(56?23)×310(4)813÷7+17×613.
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(1)450÷18×25,
=25×25,
=625;
(2)
+
÷
,
=
+
×2,
=
+
,
=
;
(3)(
?
)×
,
=
×
,
=
;
(4)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
.
=25×25,
=625;
(2)
1 |
3 |
2 |
3 |
1 |
2 |
=
1 |
3 |
2 |
3 |
=
1 |
3 |
4 |
3 |
=
5 |
3 |
(3)(
5 |
6 |
2 |
3 |
3 |
10 |
=
1 |
6 |
3 |
10 |
=
1 |
20 |
(4)
8 |
13 |
1 |
7 |
6 |
13 |
=
8 |
13 |
1 |
7 |
1 |
7 |
6 |
13 |
=(
8 |
13 |
6 |
13 |
1 |
7 |
=
14 |
13 |
1 |
7 |
=
2 |
13 |
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