
计算:(1)51÷1719 (2)23÷415 (3)18169÷326 ...
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(1)51÷
=51×
=57;
(2)
÷
=
×
=
;
(3)
÷
=
×
=
;
(4)99
÷3
=(99+
)÷3
=99÷3+
÷3
=33+
×
=33+
=33
.
17 |
19 |
=51×
19 |
17 |
=57;
(2)
2 |
3 |
4 |
15 |
=
2 |
3 |
15 |
4 |
=
5 |
2 |
(3)
18 |
169 |
3 |
26 |
=
18 |
169 |
26 |
3 |
=
12 |
13 |
(4)99
7 |
8 |
=(99+
7 |
8 |
=99÷3+
7 |
8 |
=33+
7 |
8 |
1 |
3 |
=33+
7 |
24 |
=33
7 |
24 |
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