题目内容
(1)6
×3574+642.9×66-3÷
(2)
(3)1+3
+5
+7
+9
+11
(4)解方程:
X-
=
X-
.
| 3 |
| 5 |
| 5 |
| 33 |
(2)
| 498×381+382 |
| 382×498-116 |
(3)1+3
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
(4)解方程:
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
解;(1)6
×3574+642.9×66-3÷
,
=6.6×3574+6429×6.6-3×6.6,
=6.6×(3574+6429-3),
=6.6×10000,
=66000;
(2)
,
=(498×381+382)÷[(381+1)×498-116],
=(498×381+382)÷[381×498+498-116],
=(498×381+382)÷[381×498+(498-116)],
=(498×381+382)÷(381×498+382),
=1;
(3)1+3
+5
+7
+9
+11
,
=(1+3+5+7+9+11)+(
+
+
+
+
),
=36+
,
=36
;
(4)
x-
=
x-
,
x-
-
x=
x-
-
x,
x-
=-
,
x-
+
=-
+
,
x=
,
x÷
=
÷
,
x=
.
| 3 |
| 5 |
| 5 |
| 33 |
=6.6×3574+6429×6.6-3×6.6,
=6.6×(3574+6429-3),
=6.6×10000,
=66000;
(2)
| 498×381+382 |
| 382×498-116 |
=(498×381+382)÷[(381+1)×498-116],
=(498×381+382)÷[381×498+498-116],
=(498×381+382)÷[381×498+(498-116)],
=(498×381+382)÷(381×498+382),
=1;
(3)1+3
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=(1+3+5+7+9+11)+(
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
=36+
| 5 |
| 14 |
=36
| 5 |
| 14 |
(4)
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
| 5 |
| 12 |
| 1 |
| 6 |
| 1 |
| 6 |
| 5 |
| 12 |
| 1 |
| 6 |
x=
| 5 |
| 2 |
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