题目内容
计算下面各题,能简便的要简便.
-
+
+
+
+
-
+
-
0.64+
+1.36+0.48-
-
-
+
.
7 |
12 |
5 |
24 |
2 |
3 |
7 |
15 |
7 |
8 |
4 |
15 |
1 |
8 |
5 |
6 |
5 |
7 |
1 |
6 |
1 |
7 |
0.64+
3 |
5 |
9 |
16 |
7 |
16 |
17 |
20 |
3 |
4 |
2 |
5 |
分析:(1)按照从左到右的顺序计算;
(2)运用加法结合律简算;
(3)运用加法结合律,以及连续减去两个数,等于减去这两个数的和简算;
(4)运用加法结合律,以及连续减去两个数,等于减去这两个数的和简算;
(5)按照从左到右的顺序计算.
(2)运用加法结合律简算;
(3)运用加法结合律,以及连续减去两个数,等于减去这两个数的和简算;
(4)运用加法结合律,以及连续减去两个数,等于减去这两个数的和简算;
(5)按照从左到右的顺序计算.
解答:解:(1)
-
+
,
=
+
,
=
;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)
-
+
-
,
=(
+
)-(
+
),
=1-
,
=
;
(4)0.64+
+1.36+0.48-
-
,
=(0.64+1.36)+(0.6+0.48)-(
+
),
=2+1.08-1,
=2.08;
(5)
-
+
,
=
+
,
=
.
7 |
12 |
5 |
24 |
2 |
3 |
=
9 |
24 |
2 |
3 |
=
25 |
24 |
(2)
7 |
15 |
7 |
8 |
4 |
15 |
1 |
8 |
=(
7 |
15 |
4 |
15 |
7 |
8 |
1 |
8 |
=1+1,
=2;
(3)
5 |
6 |
5 |
7 |
1 |
6 |
1 |
7 |
=(
5 |
6 |
1 |
6 |
5 |
7 |
1 |
7 |
=1-
6 |
7 |
=
1 |
7 |
(4)0.64+
3 |
5 |
9 |
16 |
7 |
16 |
=(0.64+1.36)+(0.6+0.48)-(
9 |
16 |
7 |
16 |
=2+1.08-1,
=2.08;
(5)
17 |
20 |
3 |
4 |
2 |
5 |
=
2 |
20 |
2 |
5 |
=
1 |
2 |
点评:此题主要考查分数加减法混合运算的运算顺序和应用运算定律进行简便计算.
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