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(x2y﹣xy2﹣y3)(﹣4xy2).

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2x2y3+y+3xy  2x2y2﹣2y+3xy  2x2y3+2y﹣3xy  2x2y3+y﹣3xy  
(﹣2a2b3)÷(﹣2ab)=a2b2   (3x2y﹣6xy)÷6xy=0.5x   (21x5y2﹣9x4y3)÷3x3y2=7x2﹣3xy   (3x2y+xy)÷xy=3x  
3x2y-4xy2;  x2y-4xy2;  x2y+2xy2;  -x2y-2xy2  
xy(2x-2y)2   2xy(x-y)2   4xy(x2-2xy+y2)   4xy(x-y)2   
3x2y•5xy2=-2x2y  -2x2y3•2xy=-2x3y4   28x4y2÷7x3y=4xy  (-3a-2)(3a+2)=9a2-4  
2x+2y=2xy  (x2y32=x4y5  (xy)2÷=(xy)3  2xy﹣3yx=xy  
与多项式  =2x2-3xy-y2的和是多项式  =x2+xy+y2,则A.等于(  ) A. x2-4xy-2y2 B. -x2+4xy+2y2 C. 3x2-2xy-2y2    3x2-2xy  
8x2y-24xy2=8xy(x-3y);   ax+bx+ay+by=x(a+b)+y(a+b)   12x2y+14x2y2-2xy=2xy(6x+7xy-1);  x3-8=(x-2)(x2+2x+4)  
2x2-xy-x=2x(x-y-1)   -xy2+2xy-3y=-y(xy-2x-3)   x(x-y)-y(x-y)=(x-y)2   x2-x-3=x(x-1)-3  
char sl[]="abcd";  char s2[3]="xy2";  char s3[] []='a','x','y';  char s4[2] [3]="xyz","mnp";  

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