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4x与4 y 4y与4xy 4xy2与4x2y 4xy2与4y2x
﹣3a+4a=﹣7a 4m+2n=6mn 5x+4x=20x2 6xy3﹣2xy3=4xy3
SUB STR(XY, 15,4)+SUBSTR(XY, 1,0)+SUBSTR(XY, 10) SUBSTR(XY, 15,4)+LEFT(XY, 1,10)+RIGHT(XY, 19) SUBSTR(XY, 15,4)+LEFTCXY, 10)-1- RIGHT(XY, 10) SUBSTR(XY, 15,4)+LEFT(XY, 10)+RIGHT(XY, 19,10)
xy(2x-2y)2 2xy(x-y)2 4xy(x2-2xy+y2) 4xy(x-y)2
8+XY与8+XX 6+XY与6+XX 4+XY与4+XX XX与XY
SUBSTR(XY,11,2)+SUBSTR(XY,1,8)+SUBSTR(XY,4) SUBSTR(XY,15,4)+LEFT(XY,1,10)+RIGHT(XY,19) SUBSTR(XY,15,4)+LEFT(XY,10)+RIGHT(XY,8) SUBSTR(XY,15,4)+LEFT(XY,10)*RIGHT(XY,19,10)
-4(x2+2xy2-xy) -xy(-4x+2y-1) -xy(4x-2y+1) -xy(4x-2y)
12xy-4x 12xy-10x 12xy-8x 12xy-2x
XY-2型 XY-4型 XY-42T型 XY-5型