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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)
4x2-9(y2+z2)=36 4(x2+z2)-9y2=36 4x2-9y2+z2=36 4x2-9y2-z2=36
9x224xy+16y2 9x2+12xy+16y2 9x216y2 9x2+24xy+16y2
a4+a5=a9 a3×a3×a3=3a3 (a-2)2=a2-4 (4x2y-xy2)÷(-xy)=-4x+y
)2x(3x-2)=5x2-4x ( )(2y +3x)(3x-2y)=9x2-4y2 ( )(x+2) 2=x2+2x+4 ( )(x+2)(2x-1)=2x2+5x-2
9a3·2 a2=18 a5 2 x5·3 x4=5 x9 3 x3·4 x3=12 x3 3 y3·5 y3=15 y9
(m+2)2=m2+4 (3+y)( 3-y)= 9-y2 2x(x-1)= 2x2-1 (m-3)(m+1)= m2-3
19a2b﹣9ab2=10ab 3x+3y=6xy 16y2﹣9y2=7 3x﹣4x+5x=4x
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
3x-4y-11=0 3x-4y+9=0 3x-4y-11=0或3x-4y+9=0 3x-4y+11=0或3x-4y-9=0
(x+1)(x+4)=x2+5x+4 (y+4)(y-5)=y2+9y-20 (m+2)(m-3)=m2-m-6 (x-3)(x-6)=x2-9x+18