
计算下面各题,能简便的要简便.1720×49+1720×59  ...
计算下面各题,能简便的要简便.1720×49+1720×593564÷(18+34)73×572(38+47)×5.6....
计算下面各题,能简便的要简便.1720×49+1720×59 3564÷(18+34)73×572 (38+47)×5.6.
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(1)
×
+
×
=
×(
+
)
=
×1
=
;
(2)
÷(
+
)
=
×
=
;
(3)73×
=72×
+1×
=5+
=5
;
(4)(
+
)×5.6
=
×5.6+
×5.6
=2.1+3.2
=5.3.
17 |
20 |
4 |
9 |
17 |
20 |
5 |
9 |
=
17 |
20 |
4 |
9 |
5 |
9 |
=
17 |
20 |
=
17 |
20 |
(2)
35 |
64 |
1 |
8 |
3 |
4 |
=
35 |
64 |
8 |
7 |
=
5 |
8 |
(3)73×
5 |
72 |
=72×
5 |
72 |
5 |
72 |
=5+
5 |
72 |
=5
5 |
72 |
(4)(
3 |
8 |
4 |
7 |
=
3 |
8 |
4 |
7 |
=2.1+3.2
=5.3.
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