题目内容
498+9870÷35
420.5-294÷2.8×2.1
(
-
)÷(
+
)
÷(
+
×
)
÷[(
+
)×
].
420.5-294÷2.8×2.1
(
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 8 |
| 5 |
| 12 |
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 12 |
| 4 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 7 |
| 7 |
| 20 |
(1)498+9870÷35
=498+282,
=780;
(2)420.5-294÷2.8×2.1
=420.5-220.5,
=200;
(3)(
-
)÷(
+
)
=
÷
,
=
;
(4)
÷(
+
×
)
=
÷(
+
),
=
÷
,
=
;
(5)
÷[(
+
)×
].
=
÷[
×
],
=
÷
,
=
.
=498+282,
=780;
(2)420.5-294÷2.8×2.1
=420.5-220.5,
=200;
(3)(
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 8 |
| 5 |
| 12 |
=
| 4 |
| 15 |
| 13 |
| 24 |
=
| 32 |
| 65 |
(4)
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 12 |
| 4 |
| 5 |
=
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 15 |
=
| 2 |
| 3 |
| 49 |
| 60 |
=
| 40 |
| 49 |
(5)
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 7 |
| 7 |
| 20 |
=
| 3 |
| 5 |
| 15 |
| 28 |
| 7 |
| 20 |
=
| 3 |
| 5 |
| 3 |
| 16 |
=
| 16 |
| 5 |
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