题目内容
脱式计算,能简算的要简算.
(1)25×3.2×125
(2)
×99+
(3)
×
+
÷
(4)
×20+8÷
(5)5×(
-
)÷
(6)42÷(
+
)
(1)25×3.2×125
(2)
| 1 |
| 25 |
| 1 |
| 25 |
(3)
| 5 |
| 13 |
| 1 |
| 7 |
| 6 |
| 7 |
| 13 |
| 5 |
(4)
| 4 |
| 7 |
| 7 |
| 4 |
(5)5×(
| 1 |
| 3 |
| 1 |
| 5 |
| 5 |
| 12 |
(6)42÷(
| 1 |
| 2 |
| 2 |
| 3 |
(1)25×3.2×125
=25×(4×0.8)×125,
=(25×4)×(0.8×125),
=100×100,
=10000;
(2)
×99+
=
×99
×1,
=
×(99+1),
=
×100,
=4;
(3)
×
+
÷
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)
×20+8÷
=
×20+8×
,
=
×(20+8),
=
×28,
=16;
(5)5×(
-
)÷
=5×(
-
)×
,
=(
-
)×12,
=
×12-
×12,
=4-2.4,
=1.6;
(6)42÷(
+
)
=42÷(
+
),
=42÷
,
=42×
,
=36.
=25×(4×0.8)×125,
=(25×4)×(0.8×125),
=100×100,
=10000;
(2)
| 1 |
| 25 |
| 1 |
| 25 |
=
| 1 |
| 25 |
| 1 |
| 25 |
=
| 1 |
| 25 |
=
| 1 |
| 25 |
=4;
(3)
| 5 |
| 13 |
| 1 |
| 7 |
| 6 |
| 7 |
| 13 |
| 5 |
=
| 5 |
| 13 |
| 1 |
| 7 |
| 6 |
| 7 |
| 5 |
| 13 |
=
| 5 |
| 13 |
| 1 |
| 7 |
| 6 |
| 7 |
=
| 5 |
| 13 |
=
| 5 |
| 13 |
(4)
| 4 |
| 7 |
| 7 |
| 4 |
=
| 4 |
| 7 |
| 4 |
| 7 |
=
| 4 |
| 7 |
=
| 4 |
| 7 |
=16;
(5)5×(
| 1 |
| 3 |
| 1 |
| 5 |
| 5 |
| 12 |
=5×(
| 1 |
| 3 |
| 1 |
| 5 |
| 12 |
| 5 |
=(
| 1 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
=4-2.4,
=1.6;
(6)42÷(
| 1 |
| 2 |
| 2 |
| 3 |
=42÷(
| 3 |
| 6 |
| 4 |
| 6 |
=42÷
| 7 |
| 6 |
=42×
| 6 |
| 7 |
=36.
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