简便运算:5.2×14+1.8×0.25+25%; (2013×2014+2714)÷(2014×2015-1314);12×5+1...
简便运算:5.2×14+1.8×0.25+25%;(2013×2014+2714)÷(2014×2015-1314);12×5+15×8+18×11+111×14+114...
简便运算:5.2×14+1.8×0.25+25%; (2013×2014+2714)÷(2014×2015-1314);12×5+15×8+18×11+111×14+114×17+117×20 2014÷201420142015.
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(1)5.2×
+1.8×0.25+25%
=5.2×0.25+1.8×0.25+0.25
=(5.2+1.8+1)×0.25
=8×0.25
=2;
(2)(2013×2014+2714)÷(2014×2015-1314)
=(2013×2014+2014+700)÷(2014×2015-2014+700)
=[2014×(2013+1)+700]÷[2014×(2015-1)+700]
=[2014×2014+700]÷[2014×2014+700]
=1;
(3)
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+
+
+
=
×(
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)+
×(
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)+
×(
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)+
×(
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)+
×(
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)+
×(
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=
×(
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1 |
4 |
=5.2×0.25+1.8×0.25+0.25
=(5.2+1.8+1)×0.25
=8×0.25
=2;
(2)(2013×2014+2714)÷(2014×2015-1314)
=(2013×2014+2014+700)÷(2014×2015-2014+700)
=[2014×(2013+1)+700]÷[2014×(2015-1)+700]
=[2014×2014+700]÷[2014×2014+700]
=1;
(3)
1 |
2×5 |
1 |
5×8 |
1 |
8×11 |
1 |
11×14 |
1 |
14×17 |
1 |
17×20 |
=
1 |
3 |
1 |
2 |
1 |
5 |
1 |
3 |
1 |
5 |
1 |
8 |
1 |
3 |
1 |
8 |
1 |
11 |
1 |
3 |
1 |
11 |
1 |
14 |
1 |
3 |
1 |
14 |
1 |
17 |
1 |
3 |
1 |
17 |
1 |
20 |
=
1 |
3 |
1 |
2 |
1 |
5 |
1 |
5 |