计算下面各题,怎样简便就怎样算.(1)69.4-5.185÷1.7-13.9×0.5  ...
计算下面各题,怎样简便就怎样算.(1)69.4-5.185÷1.7-13.9×0.5(2)5×(115+217)×17(3)113+1213×(52-13)(4)313×...
计算下面各题,怎样简便就怎样算.(1)69.4-5.185÷1.7-13.9×0.5 (2)5×(115+217)×17(3)113+1213×(52-13) (4)313×34+1013÷43.
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(1)69.4-5.185÷1.7-13.9×0.5,
=69.4-3.05-6.95,
=69.4-(3.05+6.95),
=69.4-10,
=59.4;
(2)5×(
+
)×17
=5×17×
+5×17×
;
=
+10,
=15
;
(3)
+
×(
-
),
=
+
×
-
×
,
=
+
?
,
=
;
(4)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
=69.4-3.05-6.95,
=69.4-(3.05+6.95),
=69.4-10,
=59.4;
(2)5×(
1 |
15 |
2 |
17 |
=5×17×
1 |
15 |
2 |
17 |
=
17 |
3 |
=15
2 |
3 |
(3)
1 |
13 |
12 |
13 |
5 |
2 |
1 |
3 |
=
1 |
13 |
12 |
13 |
5 |
2 |
1 |
3 |
12 |
13 |
=
1 |
13 |
30 |
13 |
4 |
13 |
=
27 |
13 |
(4)
3 |
13 |
3 |
4 |
10 |
13 |
4 |
3 |
=
3 |
13 |
3 |
4 |
10 |
13 |
3 |
4 |
=
3 |
4 |
10 |
13 |
3 |
13 |
=
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