已知/x+2/=0,/y-3/=0,求-5/2x-5/3y+4xy的值.
1个回答
已知/x+2/=0,/y-3/=0
得x=-2,y=3
-5/2x-5/3y+4xy
=-5/2*(-2)-5/3*3+4*(-2)*3
=5-5-24
=-24
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