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1.(121121121/212121)*(121212/132132132)2.123456789/[(1234567891^-1234567890*123456789...
1. (121121121/212121)*(121212/132132132)
2. 123456789/[(1234567891^-1234567890*1234567892)]
3. [(1999^-1999+1)/(1999^-1998^+1998*1997)] /(1/1999)
4.(19/96+1919/9696+191919/969696)/(19191919/96969696)+1/(1.3/1.7)/(1.7/7)/(7/2.6) 展开
2. 123456789/[(1234567891^-1234567890*1234567892)]
3. [(1999^-1999+1)/(1999^-1998^+1998*1997)] /(1/1999)
4.(19/96+1919/9696+191919/969696)/(19191919/96969696)+1/(1.3/1.7)/(1.7/7)/(7/2.6) 展开
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有的题目是分开做的
1. (121121121/212121)*(121212/132132132)
=(121*1001001)/(21*10101)*(12*10101)/(132*1001001) (约分)
=121/21*12/132 约分用11
=11/21
2. 123456789/[(1234567891^-1234567890*1234567892)]
[(1234567891^-1234567890*1234567892)]
=1234567890*1234567891+1234567891-1234567890*1234567891-1234567890
=1
原式=123456789
3. [(1999^-1999+1)/(1999^-1998^+1998*1997)] /(1/1999)
[(1999^-1999+1)/(1999^-1998^+1998*1997)]
=(1999*1998+1)/(1999*1998+1999-1998*1999+1998+1998*1997)
=(1999*1998+1)/(1998*1999-1998+1999)
=1
原式=1/(1/1999)
=1999
4.(19/96+1919/9696+191919/969696)/(19191919/96969696)+1/(1.3/1.7)/(1.7/7)/(7/2.6)
(19/96+1919/9696+191919/969696)/(19191919/96969696)约分
=(19/96+19/96+19/96)/(19/96)约分
=3
约分如:191919/969696=(19*10101)/(96*10101
=19/96
原式=3+1/(1.3/1.7)/(1.7/7)/(7/2.6)
1/(1.3/1.7)/(1.7/7)/(7/2.6)是分数吗????
前3道向你保证!
老天爷,你哪来这么多呀!
1. (121121121/212121)*(121212/132132132)
=(121*1001001)/(21*10101)*(12*10101)/(132*1001001) (约分)
=121/21*12/132 约分用11
=11/21
2. 123456789/[(1234567891^-1234567890*1234567892)]
[(1234567891^-1234567890*1234567892)]
=1234567890*1234567891+1234567891-1234567890*1234567891-1234567890
=1
原式=123456789
3. [(1999^-1999+1)/(1999^-1998^+1998*1997)] /(1/1999)
[(1999^-1999+1)/(1999^-1998^+1998*1997)]
=(1999*1998+1)/(1999*1998+1999-1998*1999+1998+1998*1997)
=(1999*1998+1)/(1998*1999-1998+1999)
=1
原式=1/(1/1999)
=1999
4.(19/96+1919/9696+191919/969696)/(19191919/96969696)+1/(1.3/1.7)/(1.7/7)/(7/2.6)
(19/96+1919/9696+191919/969696)/(19191919/96969696)约分
=(19/96+19/96+19/96)/(19/96)约分
=3
约分如:191919/969696=(19*10101)/(96*10101
=19/96
原式=3+1/(1.3/1.7)/(1.7/7)/(7/2.6)
1/(1.3/1.7)/(1.7/7)/(7/2.6)是分数吗????
前3道向你保证!
老天爷,你哪来这么多呀!
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