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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
a4+a5=a9 a3×a3×a3=3a3 (a-2)2=a2-4 (4x2y-xy2)÷(-xy)=-4x+y
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
3a2+a2=3a4 8xy﹣7xy=xy 3x2y﹣xy2=2x2y 3a+b=3ab
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
﹣2x+3x=x 6xy2÷2xy=3y (﹣2x2y)3=﹣6x6y3 2xy2•(﹣x)=﹣2x2y2
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
char sl[]="abcd"; char s2[3]="xy2"; char s3[] []='a','x','y'; char s4[2] [3]="xyz","mnp";
4x2y2 -4x2y2 -12x3y3 12x3y3