
脱式计算(能简便算的要简算).(3.8-1.8÷2)×0.5  ...
脱式计算(能简便算的要简算).(3.8-1.8÷2)×0.5910÷[12×(65-310)]25+37+35+4719×15+15×14+17×20%...
脱式计算(能简便算的要简算).(3.8-1.8÷2)×0.5 910÷[12×(65-310)]25+37+35+4719×15+15×14+17×20%
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(1)(3.8-1.8÷2)×0.5
=(3.8-0.9)×0.5,
=2.9×0.5,
=1.45;
(2)
÷[
×(
-
)]
=
÷[
×
].
=
÷
,
=2;
(3)
+
+
+
=(
+
)+(
+
),
=1+1,
=2;
(4)19×
+
×14+17×20%
=19×
+
×14+17×
,
=(19+14+17)×
,
=50×
,
=10.
=(3.8-0.9)×0.5,
=2.9×0.5,
=1.45;
(2)
9 |
10 |
1 |
2 |
6 |
5 |
3 |
10 |
=
9 |
10 |
1 |
2 |
9 |
10 |
=
9 |
10 |
9 |
20 |
=2;
(3)
2 |
5 |
3 |
7 |
3 |
5 |
4 |
7 |
=(
2 |
5 |
3 |
5 |
3 |
7 |
4 |
7 |
=1+1,
=2;
(4)19×
1 |
5 |
1 |
5 |
=19×
1 |
5 |
1 |
5 |
1 |
5 |
=(19+14+17)×
1 |
5 |
=50×
1 |
5 |
=10.
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