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写出计算的主要过程,能简便的要用简便方法计算.12.75-517+1146.3÷[(412-0.07×50)×127]45×(29+715-15)512×0.8+712÷1.25.
题目详情
写出计算的主要过程,能简便的要用简便方法计算.
12.75-
+1
6.3÷[(4
-0.07×50)×1
]
45×(
+
-
)
×0.8+
÷1.25.
12.75-
5 |
17 |
1 |
4 |
6.3÷[(4
1 |
2 |
2 |
7 |
45×(
2 |
9 |
7 |
15 |
1 |
5 |
5 |
12 |
7 |
12 |
▼优质解答
答案和解析
(1)12.75-
+1
,
=12.75-
+1.25,
=12.75+1.25-
,
=14-
,
=13
;
(2)6.3÷[(4
-0.07×50)×1
],
=6.3÷[(4
-3.5)×1
],
=6.3÷[(4
-3
)×1
],
=6.3÷[(4
-3
)×1
],
=6.3÷[1×1
],
=6.3÷1
,
=6.3×
,
=4.9;
(3)45×(
+
-
),
=45×
+45×
-45×
,
=10+21-9,
=22;
(4)
×0.8+
÷1.25,
=
×0.8+
÷
5 |
17 |
1 |
4 |
=12.75-
5 |
17 |
=12.75+1.25-
5 |
17 |
=14-
5 |
17 |
=13
12 |
17 |
(2)6.3÷[(4
1 |
2 |
2 |
7 |
=6.3÷[(4
1 |
2 |
2 |
7 |
=6.3÷[(4
1 |
2 |
1 |
2 |
2 |
7 |
=6.3÷[(4
1 |
2 |
1 |
2 |
2 |
7 |
=6.3÷[1×1
2 |
7 |
=6.3÷1
2 |
7 |
=6.3×
7 |
9 |
=4.9;
(3)45×(
2 |
9 |
7 |
15 |
1 |
5 |
=45×
2 |
9 |
7 |
15 |
1 |
5 |
=10+21-9,
=22;
(4)
5 |
12 |
7 |
12 |
=
5 |
12 |
7 |
12 |
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2017-11-13
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