题目内容
列式计算
(1)
与
的和比它们的差多多少?
(2)
加
与
的差,和是多少?
(1)
| 7 |
| 8 |
| 2 |
| 5 |
(2)
| 17 |
| 20 |
| 2 |
| 5 |
| 1 |
| 6 |
分析:(1)先算
与
的和,
与
的差,所得的和减去所得的差即可;
(2)先算
与
的差,用
加上所得的差即可.
| 7 |
| 8 |
| 2 |
| 5 |
| 7 |
| 8 |
| 2 |
| 5 |
(2)先算
| 2 |
| 5 |
| 1 |
| 6 |
| 17 |
| 20 |
解答:解:(1)(
+
)-(
-
),
=
+
-
+
,
=(
-
)+(
+
),
=0+
,
=
.
答:多
.
(2)
+(
-
),
=
+
,
=
.
答:和是
.
| 7 |
| 8 |
| 2 |
| 5 |
| 7 |
| 8 |
| 2 |
| 5 |
=
| 7 |
| 8 |
| 2 |
| 5 |
| 7 |
| 8 |
| 2 |
| 5 |
=(
| 7 |
| 8 |
| 7 |
| 8 |
| 2 |
| 5 |
| 2 |
| 5 |
=0+
| 4 |
| 5 |
=
| 4 |
| 5 |
答:多
| 4 |
| 5 |
(2)
| 17 |
| 20 |
| 2 |
| 5 |
| 1 |
| 6 |
=
| 17 |
| 20 |
| 7 |
| 30 |
=
| 13 |
| 12 |
答:和是
| 13 |
| 12 |
点评:根据题意,先弄清运算顺序,然后再列式计算即可.
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