你可能感兴趣的试题
-x4-y4 4m2+n2 -x4 (a+b)2-81
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)
x2-4x+4 1+4x2 4y2+4y-1 x2+xy+y2
﹣a2+b2 ﹣x2﹣y2 49x2y2﹣z2 16m4﹣25n2p2
x2+2xy-y2 x2-xy+4y2 x2-xy+ x2—5xy+10y2
x2+4y2 x2-2y+1 -x2+4y2 -x2-4y2
(a+1)(a-1)=a2-1 a2-6a+9=(a-3)2 x2+2x+1=x(x+2x)+1 -18x4y3=-6x2y2·3x2y
x2+4y2 x2﹣2y2+1 ﹣x2+4y2 ﹣x2﹣4y2
(y﹣1)(y+1)=y2﹣1 x2y+xy2﹣1=xy(x+y)﹣1 (x﹣2)(x﹣3)=(3﹣x)(2﹣x) x2﹣4x+4=(x﹣2)2