(1)
2(X+Y)-三分之二(X—Y)+四分之一(X+Y)+三分之二(X-Y)
=2(X+Y)-2/3(X-Y)+1/4(X+Y)+2/3(X-Y)
=2(X+Y)+1/4(X+Y)-2/3(X-Y) +2/3(X-Y)
=9/4(X+Y)
=9X/4+9Y/4
(2)
是单项式的为:
三分之二XY的平方, 2的5次方T的七次方,-3A的平方B的立方C,-π分之X
(1)
2(X+Y)-三分之二(X—Y)+四分之一(X+Y)+三分之二(X-Y)
=2(X+Y)-2/3(X-Y)+1/4(X+Y)+2/3(X-Y)
=2(X+Y)+1/4(X+Y)-2/3(X-Y) +2/3(X-Y)
=9/4(X+Y)
=9X/4+9Y/4
(2)
是单项式的为:
三分之二XY的平方, 2的5次方T的七次方,-3A的平方B的立方C,-π分之X