题目内容
| 1 |
| 4×5 |
| 1 |
| 5×6 |
| 1 |
| 6×7 |
| 1 |
| 99×100 |
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 99×101 |
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
511×
| 373737 |
| 737373 |
(1)
+
+
+…+
,
=
-
+
-
+
-
+…+
-
,
=
-
,
=
;
(2)
+
+
+…+
,
=
×(1-
+
-
+
-
+…+
-
),
=
×(1-
),
=
×
,
=
;
(3)
-
+
-
+
-
,
=
+
-(
+
)+(
+
)-(
+
)+(
+
)-(
+
),
=
+
-
-
+
+
-
-
+
+
-
-
,
=
-
,
=
-
,
=
;
(4)511×
,
=511×
,
=511×
,
=259.
| 1 |
| 4×5 |
| 1 |
| 5×6 |
| 1 |
| 6×7 |
| 1 |
| 99×100 |
=
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 99 |
| 1 |
| 100 |
=
| 1 |
| 4 |
| 1 |
| 100 |
=
| 6 |
| 25 |
(2)
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 99×101 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 99 |
| 1 |
| 101 |
=
| 1 |
| 2 |
| 1 |
| 101 |
=
| 1 |
| 2 |
| 100 |
| 101 |
=
| 50 |
| 101 |
(3)
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
=
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
=
| 1 |
| 2 |
| 1 |
| 8 |
=
| 4 |
| 8 |
| 1 |
| 8 |
=
| 3 |
| 8 |
(4)511×
| 373737 |
| 737373 |
=511×
| 37×10101 |
| 73×10101 |
=511×
| 37 |
| 73 |
=259.
练习册系列答案
相关题目