题目内容
简便计算
(1)4.85-
+5.15-
(2)
×(4
÷
-3.6+6.15×3
)
(3)
÷[(
+
)×
]
(4)1
+3
+5
+7
+9
.
(1)4.85-
| 5 |
| 9 |
| 4 |
| 9 |
(2)
| 1 |
| 9 |
| 3 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
(3)
| 3 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 3 |
| 7 |
(4)1
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
(1)4.85-
+5.15-
,
=4.85+5.15-(
+
),
=10-1,
=9;
(2)
×(4
÷
-3.6+6.15×3
),
=
×(4.75×
-3.6+6.15×3.6),
=
×[(4.75+6.15-1)×3.6],
=
×9.9×3.6,
=3.96;
(3)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×
,
=1
;
(4)1
+3
+5
+7
+9
.
=(1+3+5+7+9)+(
+
)+(
+
)+
,
=25+(
+
)+(
+
)+
,
=25+
+
+
,
=25+(
+
)+
,
=25+
+
,
=25+(
+
),
=25
=25
.
| 5 |
| 9 |
| 4 |
| 9 |
=4.85+5.15-(
| 5 |
| 9 |
| 4 |
| 9 |
=10-1,
=9;
(2)
| 1 |
| 9 |
| 3 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
=
| 1 |
| 9 |
| 18 |
| 5 |
=
| 1 |
| 9 |
=
| 1 |
| 9 |
=3.96;
(3)
| 3 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 3 |
| 7 |
=
| 3 |
| 4 |
| 21 |
| 20 |
| 3 |
| 7 |
=
| 3 |
| 4 |
| 9 |
| 20 |
=
| 3 |
| 4 |
| 20 |
| 9 |
=1
| 2 |
| 3 |
(4)1
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(1+3+5+7+9)+(
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=25+(
| 2 |
| 12 |
| 1 |
| 12 |
| 3 |
| 60 |
| 2 |
| 60 |
| 1 |
| 42 |
=25+
| 3 |
| 12 |
| 5 |
| 60 |
| 1 |
| 42 |
=25+(
| 3 |
| 12 |
| 1 |
| 12 |
| 1 |
| 42 |
=25+
| 1 |
| 3 |
| 1 |
| 42 |
=25+(
| 14 |
| 42 |
| 1 |
| 42 |
=25
| 15 |
| 42 |
=25
| 5 |
| 14 |
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