(-3x^y+2xy)-( )=4x^+xy
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(-3x^y+2xy)-()=4x^+xy(-3x^y+2xy)-()=4x^+xy(-3x^y+2xy)-()=4x^+xy(-3x^y+2xy)-(4x^+xy)=-3x^y+2xy-4x^-xy
(-3x^y+2xy)-( )=4x^+xy
(-3x^y+2xy)-( )=4x^+xy
(-3x^y+2xy)-( )=4x^+xy
(-3x^y+2xy)-(4x^+xy)
=-3x^y+2xy-4x^-xy
=-3x^y+xy-4x^
所以填上-3x^y+xy-4x^
等比a3²=a1a4
(a1+2d)²=a1(a1+3d)
a1d+4d²=0
d≠0
a1=-4d
所以原式=(a1+a1+2d+a1+8d)/(a1+d+a1+3d+a1+9d)
=(3a1+10d)/(3a1+13d)
=(-12d+10d)/(-12d+13d)
=-2
(-3x^y+2xy)-( )=4x^+xy
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