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1.a+b=2,ab=3,则a^2b+ab^2=__ab(a+b)=3*2=6___2.若x^2+3(m+2)x+81是一个完全平方式,则m=_____81=(±9)^2所以3(m+2)=2*(±9)=±18m+2=±6m=4或-82.巳知x,y为任意实数,且m=x^2+y^2,n=2xy,则m,n=_______m-n=x^2-2xy+y^2=(x-y)^2>=0所以m>=n4.1/16a^4b^2-81c^2=(1/4a^2b)^2-(9c)^2=____(1/4a^2b+3c)(1/4a^2b-3c)_________5.25a^2b^2-( 30abcd)+9c^2... |
