题目内容
用递等式计算
(1)1379+450÷18×40
(2)(3.2÷16+10.8)÷22
(3)
×
+
×
(4)
×
÷(
-
)
(1)1379+450÷18×40
(2)(3.2÷16+10.8)÷22
(3)
| 5 |
| 11 |
| 7 |
| 25 |
| 7 |
| 25 |
| 6 |
| 11 |
(4)
| 1 |
| 4 |
| 1 |
| 7 |
| 5 |
| 6 |
| 3 |
| 4 |
(1)1379+450÷18×40,
=1379+25×40,
=1379+1000,
=2379;
(2)(3.2÷16+10.8)÷22,
=(0.2+10.8)÷22,
=11÷22,
=0.5;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
×
÷(
-
),
=
×
÷
,
=
×
×12,
=
×12×
,
=3×
,
=
.
=1379+25×40,
=1379+1000,
=2379;
(2)(3.2÷16+10.8)÷22,
=(0.2+10.8)÷22,
=11÷22,
=0.5;
(3)
| 5 |
| 11 |
| 7 |
| 25 |
| 7 |
| 25 |
| 6 |
| 11 |
=(
| 5 |
| 11 |
| 6 |
| 11 |
| 7 |
| 25 |
=1×
| 7 |
| 25 |
=
| 7 |
| 25 |
(4)
| 1 |
| 4 |
| 1 |
| 7 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 7 |
| 1 |
| 12 |
=
| 1 |
| 4 |
| 1 |
| 7 |
=
| 1 |
| 4 |
| 1 |
| 7 |
=3×
| 1 |
| 7 |
=
| 3 |
| 7 |
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