数学大神求救!!!!!!!
2个回答
2014-02-12
展开全部
C
(2x-5)(2x+5)
2(x+2)(x-2)
a(3+b)(3-b)
4mn(m+n)(m-n)
(x+y)(x-y)=-4*8=-32
(m^2-n^2)/(m-n)=6/3=2
(7.29+2.71)(7.29-2.71)=10*4.58=45.8
1000^2/(252+248)(252-248)=1000^2/500*4=500
6x-4y=3 3x-2y=3/2 9x^2-4y^2=(3x+2y)(3x-2y)=4* 3/2=6
(2x-5)(2x+5)
2(x+2)(x-2)
a(3+b)(3-b)
4mn(m+n)(m-n)
(x+y)(x-y)=-4*8=-32
(m^2-n^2)/(m-n)=6/3=2
(7.29+2.71)(7.29-2.71)=10*4.58=45.8
1000^2/(252+248)(252-248)=1000^2/500*4=500
6x-4y=3 3x-2y=3/2 9x^2-4y^2=(3x+2y)(3x-2y)=4* 3/2=6
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