题目内容
(
+
+
)×(
+
+
)-(
+
+
+
)×(
+
)=
.
| 1 |
| 2 |
| 1992 |
| 1993 |
| 1993 |
| 1994 |
| 1992 |
| 1993 |
| 1993 |
| 1994 |
| 1994 |
| 1995 |
| 1992 |
| 1993 |
| 1993 |
| 1994 |
| 1994 |
| 1995 |
| 1 |
| 2 |
| 1992 |
| 1993 |
| 1993 |
| 1994 |
| 997 |
| 1995 |
| 997 |
| 1995 |
分析:此题可以用字母代表数,然后化简,这样可以使计算简化.
解答:解:设
+
=a,
+
+
=b,
原式=(
+a)×b-(b+
)×a,
=
b+ab-ab-
a,
=
×(b-a),
=
×[(
+
+
)-(
+
)],
=
×
,
=
.
故答案为:
.
| 1992 |
| 1993 |
| 1993 |
| 1994 |
| 1992 |
| 1993 |
| 1993 |
| 1994 |
| 1994 |
| 1995 |
原式=(
| 1 |
| 2 |
| 1 |
| 2 |
=
| 1 |
| 2 |
| 1 |
| 2 |
=
| 1 |
| 2 |
=
| 1 |
| 2 |
| 1992 |
| 1993 |
| 1993 |
| 1994 |
| 1994 |
| 1995 |
| 1992 |
| 1993 |
| 1993 |
| 1994 |
=
| 1 |
| 2 |
| 1994 |
| 1995 |
=
| 997 |
| 1995 |
故答案为:
| 997 |
| 1995 |
点评:此题考查学生运用所学知识,灵活进行巧算的能力.
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