第5,6,7三个大题
1个回答
展开全部
5.25^7-5^12
=5^(7*2)-5^12
=5^14-5^12
=5^12(5^2 -1)
=5^12 *24
=5^11*120
6.x+y=1
x^2+2xy+y^2=1
1/2(x^2+2xy+y^2)=1/2
1/2x^2+xy+1/2y^2=1/2
7(1)3^2014-3^2013
=3^2013(3-1)
=2*3^2013
(2) .(-2)^101+(-2)^100+2^99
=2^100+2^99-2^101
=2^99(2+1-2^2)
=2^99(3-4)
=-2^99
求接纳
=5^(7*2)-5^12
=5^14-5^12
=5^12(5^2 -1)
=5^12 *24
=5^11*120
6.x+y=1
x^2+2xy+y^2=1
1/2(x^2+2xy+y^2)=1/2
1/2x^2+xy+1/2y^2=1/2
7(1)3^2014-3^2013
=3^2013(3-1)
=2*3^2013
(2) .(-2)^101+(-2)^100+2^99
=2^100+2^99-2^101
=2^99(2+1-2^2)
=2^99(3-4)
=-2^99
求接纳
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