题目内容
(2012?云阳县)看谁都能算对!(能简算的请写出简算过程)
75÷8+24×12.5%+
2×3.14×8+3.14×82
24×
+51×
×[
×(
+
)].
75÷8+24×12.5%+
| 1 |
| 8 |
2×3.14×8+3.14×82
24×
| 51 |
| 43 |
| 19 |
| 43 |
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
分析:(1)运用乘法分配律解答,
(2)运用乘法交换律以及乘法分配律解答,
(3)化51×
=19×
,再运用乘法分配律解答,
(4)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序解答.
(2)运用乘法交换律以及乘法分配律解答,
(3)化51×
| 19 |
| 43 |
| 51 |
| 43 |
(4)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序解答.
解答:解;(1)75÷8+24×12.5%+
,
=(75+24+1)×
,
=100×
,
=12.5;
(2)2×3.14×8+3.14×82,
=3.14×16+3.14×64,
=3.14×(16+64),
=3.14×80,
=251.2;
(3)24×
+51×
,
=24×
+19×
,
=(24+19)×
,
=43×
,
=51;
(4)
×[
×(
+
)],
=
×[
×
],
=
×
,
=
.
| 1 |
| 8 |
=(75+24+1)×
| 1 |
| 8 |
=100×
| 1 |
| 8 |
=12.5;
(2)2×3.14×8+3.14×82,
=3.14×16+3.14×64,
=3.14×(16+64),
=3.14×80,
=251.2;
(3)24×
| 51 |
| 43 |
| 19 |
| 43 |
=24×
| 51 |
| 43 |
| 51 |
| 43 |
=(24+19)×
| 51 |
| 43 |
=43×
| 51 |
| 43 |
=51;
(4)
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 1 |
| 2 |
| 6 |
| 5 |
=
| 9 |
| 20 |
| 3 |
| 5 |
=
| 27 |
| 100 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
练习册系列答案
相关题目