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(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%+182×3.14×8+3.14×8224×5143+51×1943920×[12×(25+45)].
题目详情
(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 |
▼优质解答
答案和解析
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 |
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