
下面各题怎样简便就怎样计算. 58×19+38÷119 167?34+17?14 34+3×76 13÷(23?25)
下面各题怎样简便就怎样计算.58×19+38÷119167?34+17?1434+3×7613÷(23?25)....
下面各题怎样简便就怎样计算. 58×19+38÷119 167?34+17?14 34+3×76 13÷(23?25).
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(1)
×19+
÷
=
×19+
×19
=(
+
)×19
=1×19
=19;
(2)1
-
+
-
=(1
+
)-(
+
)
=2-1
=1;
(3)
+3×
=
+
=
;
(4)
÷(
-
)
=
÷
=
.
5 |
8 |
3 |
8 |
1 |
19 |
=
5 |
8 |
3 |
8 |
=(
5 |
8 |
3 |
8 |
=1×19
=19;
(2)1
6 |
7 |
3 |
4 |
1 |
7 |
1 |
4 |
=(1
6 |
7 |
1 |
7 |
3 |
4 |
1 |
4 |
=2-1
=1;
(3)
3 |
4 |
7 |
6 |
=
3 |
4 |
7 |
2 |
=
17 |
4 |
(4)
1 |
3 |
2 |
3 |
2 |
5 |
=
1 |
3 |
4 |
15 |
=
5 |
4 |
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