用递等式计算,能简算的简算(1)85×54÷18+745(2)3.4÷[(1.25+0.45)×23](3)35×(1?37)÷512(4
用递等式计算,能简算的简算(1)85×54÷18+745(2)3.4÷[(1.25+0.45)×23](3)35×(1?37)÷512(4)(156×413?26)×81...
用递等式计算,能简算的简算(1)85×54÷18+745(2)3.4÷[(1.25+0.45)×23](3)35×(1?37)÷512(4)(156×413?26)×811(5)78×1213+78÷13.
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(1)85×54÷18+745
=85×(54÷18)+745,
=85×3+745,
=255+745,
=1000;
(2)3.4÷[(1.25+0.45)×23]
=3.4÷(1.25+0.45)÷23,
=3.4÷1.7÷23,
=2÷23,
=
2 |
23 |
(3)35×(1?
3 |
7 |
5 |
12 |
=35×
4 |
7 |
5 |
12 |
=20÷
5 |
12 |
=48;
(4)(156×
4 |
13 |
8 |
11 |
=(48-26)×
8 |
11 |
=22×
8 |
11 |
=16;
(5)
7 |
8 |
12 |
13 |
7 |
8 |
=
7 |
8 |
12 |
13 |
7 |
8 |
1 |
13 |
=
7 |
8 |
12 |
13 |
1 |
13 |
=
7 |
8 |
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