题目内容
脱式计算,能简算的就简算.
÷[
-(
-
)]
38
-15.38+61.25-4.62
×5.65+3.35×
+
125×83-25×15.
| 7 |
| 12 |
| 3 |
| 4 |
| 11 |
| 20 |
| 1 |
| 2 |
38
| 3 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
125×83-25×15.
(1)
÷[
-(
-
)],
=
÷[
-
],
=
÷
,
=
;
(2)38
-15.38+61.25-4.62,
=(38
+61.25)-(15.38+4.62),
=100-20,
=80;
(3)
×5.65+3.35×
+
,
=
×(5.65+3.35+1),
=
×10,
=
;
(4)125×83-25×15,
=(25×5)×83-25×15,
=25×415-25×15,
=25×(415-15),
=25×400,
=10000.
| 7 |
| 12 |
| 3 |
| 4 |
| 11 |
| 20 |
| 1 |
| 2 |
=
| 7 |
| 12 |
| 3 |
| 4 |
| 1 |
| 20 |
=
| 7 |
| 12 |
| 7 |
| 10 |
=
| 5 |
| 6 |
(2)38
| 3 |
| 4 |
=(38
| 3 |
| 4 |
=100-20,
=80;
(3)
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 5 |
| 4 |
(4)125×83-25×15,
=(25×5)×83-25×15,
=25×415-25×15,
=25×(415-15),
=25×400,
=10000.
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