题目内容
|
| 2.8×(
| ||||||||||||||||||
(
|
|
(1)
×
÷
,
=
×
×
,
=1
;
(2)
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)2.8×(
+
),
=2.8×
+
×2.8,
=0.4+0.3,
=0.7;
(4)(
-
÷
)×
,
=(
-
)×
,
=
×
,
=
;
(5)
×
+
÷
+
,
=
×
+
×
+
,
=
×(
+
+1),
=9.5.
| 9 |
| 14 |
| 3 |
| 8 |
| 3 |
| 14 |
=
| 9 |
| 14 |
| 3 |
| 8 |
| 14 |
| 3 |
=1
| 1 |
| 8 |
(2)
| 2 |
| 9 |
| 3 |
| 5 |
| 4 |
| 9 |
| 3 |
| 5 |
=(
| 2 |
| 9 |
| 4 |
| 9 |
| 3 |
| 5 |
=
| 2 |
| 3 |
| 3 |
| 5 |
=
| 2 |
| 5 |
(3)2.8×(
| 1 |
| 7 |
| 3 |
| 28 |
=2.8×
| 1 |
| 7 |
| 3 |
| 28 |
=0.4+0.3,
=0.7;
(4)(
| 1 |
| 2 |
| 1 |
| 4 |
| 5 |
| 8 |
| 5 |
| 7 |
=(
| 1 |
| 2 |
| 2 |
| 5 |
| 5 |
| 7 |
=
| 1 |
| 10 |
| 5 |
| 7 |
=
| 1 |
| 14 |
(5)
| 19 |
| 4 |
| 1 |
| 5 |
| 19 |
| 4 |
| 5 |
| 4 |
| 19 |
| 4 |
=
| 19 |
| 4 |
| 1 |
| 5 |
| 19 |
| 4 |
| 4 |
| 5 |
| 19 |
| 4 |
=
| 19 |
| 4 |
| 1 |
| 5 |
| 4 |
| 5 |
=9.5.
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