题目内容
用递等式计算:
(1)2108+540÷18×24
(2)(
+2
)÷(2+3
)
(3)
×[0.75-(
-0.25)]
(4)[1
+(0.65+
)÷
]×4.8.
(1)2108+540÷18×24
(2)(
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
(3)
| 4 |
| 7 |
| 7 |
| 16 |
(4)[1
| 1 |
| 8 |
| 7 |
| 20 |
| 1 |
| 7 |
(1)2108+540÷18×24,
=2108+30×24,
=2108+720,
=2828;
(2)(
+2
)÷(2+3
),
=2
÷5
,
=
;
(3)
×[0.75-(
-0.25)],
=
×[0.75-
],
=
×
,
=
;
(4)[1
+(0.65+
)÷
]×4.8,
=[1
+1÷
]×4.8,
=[1
+7]×4.8,
=8
×4.8,
=39.
=2108+30×24,
=2108+720,
=2828;
(2)(
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
=2
| 5 |
| 6 |
| 2 |
| 3 |
=
| 1 |
| 2 |
(3)
| 4 |
| 7 |
| 7 |
| 16 |
=
| 4 |
| 7 |
| 3 |
| 16 |
=
| 4 |
| 7 |
| 9 |
| 16 |
=
| 9 |
| 28 |
(4)[1
| 1 |
| 8 |
| 7 |
| 20 |
| 1 |
| 7 |
=[1
| 1 |
| 8 |
| 1 |
| 7 |
=[1
| 1 |
| 8 |
=8
| 1 |
| 8 |
=39.
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