题目内容
列式计算.
与
的和乘
减去
的差,积是多少?
| 1 |
| 6 |
| 7 |
| 8 |
| 3 |
| 5 |
| 1 |
| 3 |
分析:
与
的和为
+
,
减去
的差为
-
,所以,
与
的和乘
减去
的差,积是(
+
)×(
-
).
| 1 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
| 7 |
| 8 |
| 3 |
| 5 |
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 3 |
| 1 |
| 6 |
| 7 |
| 8 |
| 3 |
| 5 |
| 1 |
| 3 |
| 1 |
| 6 |
| 7 |
| 8 |
| 3 |
| 5 |
| 1 |
| 3 |
解答:解:(
+
)×(
-
)
=(
+
)×(
-
),
=
×
,
=
.
答:积是
.
| 1 |
| 6 |
| 7 |
| 8 |
| 3 |
| 5 |
| 1 |
| 3 |
=(
| 4 |
| 24 |
| 21 |
| 24 |
| 9 |
| 15 |
| 5 |
| 15 |
=
| 25 |
| 24 |
| 4 |
| 15 |
=
| 5 |
| 18 |
答:积是
| 5 |
| 18 |
点评:完成本题在计算时要细心,注意通分约分.
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