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.
练习册系列答案
相关题目
计算下面各题,能简便计算的要简便计算.
| ①26.7+3.3×1.2+0.04 | ②4.8×12.5×0.8 | ③2.5×(6+9.728÷3.2) |
| ④24×10.2 | ⑤6.3÷(2.1×2) | ⑥100.8÷[(10.79+6.49)÷4.8]. |