⒈-4x^ay+x²y^b=-3x²y,则a+b= ⒉若x+y3,xy=1,则x²+y
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⒈-4x^ay+x²y^b=-3x²y,则a+b= ⒉若x+y3,xy=1,则x²+y²= ⒊若代
⒈-4x^ay+x²y^b=-3x²y,则a+b=
⒉若x+y3,xy=1,则x²+y²=
⒊若代数式x²+3x+2可以表示为(x-1)²+a(x-1)+b的形式,则a+b的值是
⒈-4x^ay+x²y^b=-3x²y,则a+b=
⒉若x+y3,xy=1,则x²+y²=
⒊若代数式x²+3x+2可以表示为(x-1)²+a(x-1)+b的形式,则a+b的值是
(1)因为两个式子能合并同类项,∴相同字母的指数相同
即a=2,b=1,∴a+b=3
(2)x²+y²=(x+y)²-2xy=9-2=7
(3)x²+3x+2=x²-2x+1+5x+1
=(x-1)²+5x-5+6
=(x-1)²+5(x-1)+6
∴a=5,b=6,∴a+b=11
即a=2,b=1,∴a+b=3
(2)x²+y²=(x+y)²-2xy=9-2=7
(3)x²+3x+2=x²-2x+1+5x+1
=(x-1)²+5x-5+6
=(x-1)²+5(x-1)+6
∴a=5,b=6,∴a+b=11
⒈-4x^ay+x²y^b=-3x²y,则a+b= ⒉若x+y3,xy=1,则x²+y
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