
脱式计算,能简算的要简算84×23-19 &nb...
脱式计算,能简算的要简算84×23-1927÷415+57×415(12-38)÷3415×(45-23)...
脱式计算,能简算的要简算84×23-19 27÷415+57×415 (12-38)÷34 15×(45-23)
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(1)84×
-19
=56-19
=37;
(2)
÷
+
×
=
+
=
;
(3)(
-
)÷
=
÷
=
;
(4)15×(
-
)
=15×
?15×
=12-10
=2.
2 |
3 |
=56-19
=37;
(2)
2 |
7 |
4 |
15 |
5 |
7 |
4 |
15 |
=
15 |
14 |
4 |
21 |
=
53 |
42 |
(3)(
1 |
2 |
3 |
8 |
3 |
4 |
=
1 |
8 |
3 |
4 |
=
1 |
6 |
(4)15×(
4 |
5 |
2 |
3 |
=15×
4 |
5 |
2 |
3 |
=12-10
=2.
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