题目内容
(2009?灵武市)
| 用你喜欢的方法计算 1200-397 |
247+3.08+253 | ||||||||
| 100÷8÷1.25 | 15
| ||||||||
5
|
2.25×4.8+0.48×77.5. |
分析:(1)运用减法性质解答;
(2)运用加法交换律解答;
(3)运用除法性质解答;
(4)(6)运用乘法分配律解答;
(5)运用加法交换律以及减法性质解答.
(2)运用加法交换律解答;
(3)运用除法性质解答;
(4)(6)运用乘法分配律解答;
(5)运用加法交换律以及减法性质解答.
解答:解:(1)1200-397
=1200-400+3
=800+3
=803;
(2)247+3.08+253
=247+253+3.08
=500+3.08
=503.08;
(3)100÷8÷1.25
=100÷(8×1.25)
=100÷10
=10;
(4)15
×7
=15×7+
×7
=105+6
=111;
(5)5
-6
+9
-3
=(5
+9
)-(6
+3
)
=15-10
=5;
(6)2.25×4.8+0.48×77.5
=4.8×(2.25+7.75)
=4.8×10
=48.
=1200-400+3
=800+3
=803;
(2)247+3.08+253
=247+253+3.08
=500+3.08
=503.08;
(3)100÷8÷1.25
=100÷(8×1.25)
=100÷10
=10;
(4)15
| 6 |
| 7 |
=15×7+
| 6 |
| 7 |
=105+6
=111;
(5)5
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
=(5
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
=15-10
=5;
(6)2.25×4.8+0.48×77.5
=4.8×(2.25+7.75)
=4.8×10
=48.
点评:本题主要考查学生正确运用简便方法解决问题的能力.
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