题目内容
简便计算.
8×7.3+8×2.7
3
-
-
+
+
+
+
-
+
.
8×7.3+8×2.7
3
5 |
6 |
2 |
5 |
3 |
5 |
5 |
6 |
8 |
17 |
1 |
6 |
9 |
17 |
2 |
5 |
5 |
7 |
2 |
5 |
5 |
7 |
分析:(1)运用乘法分配律解答,
(2)依据减法的性质解答,
(3)(4)运用加法交换律和结合律解答.
(2)依据减法的性质解答,
(3)(4)运用加法交换律和结合律解答.
解答:解:(1)8×7.3+8×2.7,
=8×(7.3+2.7),
=8×10,
=80;
(2)3
-
-
,
=3
-(
+
),
=3
-1,
=2
;
(3)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(4)
+
-
+
,
=(
-
)+(
+
),
=0+
,
=1
.
=8×(7.3+2.7),
=8×10,
=80;
(2)3
5 |
6 |
2 |
5 |
3 |
5 |
=3
5 |
6 |
2 |
5 |
3 |
5 |
=3
5 |
6 |
=2
5 |
6 |
(3)
5 |
6 |
8 |
17 |
1 |
6 |
9 |
17 |
=(
5 |
6 |
1 |
6 |
8 |
17 |
9 |
17 |
=1+1,
=2;
(4)
2 |
5 |
5 |
7 |
2 |
5 |
5 |
7 |
=(
2 |
5 |
2 |
5 |
5 |
7 |
5 |
7 |
=0+
10 |
7 |
=1
3 |
7 |
点评:本题主要考查学生正确选择四则运算简便算法解决问题的能力.
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