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x=2,y=1 x=3,y=1 x=,y=1 x=1,y=3
x2+6xy+9y2=(x+3y)2 2x2﹣4xy+9y2=(2x﹣3y)2 2x2﹣8y2=2(x+4y)(x﹣4y) x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
y=7 y=-2x y=7-2x y=-2x-7
y=3x2+2x﹣5 y=3x2+2x﹣4 y=3x2+2x+3 y=3x2+2x+4
={(x,y)|y=2x2,x∈R},集合 ={(x,y)|y=2x,x∈R},则集合A.∩B的真子集的个数是( ) A.4B.5 6 7
2x+y﹣8=0 3x﹣2y+1=0 x+2y﹣5=0 3x+2y﹣7=0
y=0.8x+3 y=-1.2x+7.5 y=1.6x+0.5 y=1.3x+1.2
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
(-3,5),(-3,-3) (3,3),(3,-5) (1,1),(-7,1) (7,-1),(-1,-1)
y=2x2-4x-5 y=-2x2+4x-1 y=2x2+12x+19 y=-2x2-12x-17
x2+x2=x4 3x3y2﹣2x3y2=1 4x2y3+5x3y2=9x5y5 5x2y4﹣3x2y4=2x2y4