已知x^-XY=60 ,XY-Y^=40,求代数式X^-Y^和2X^-5XY+3Y^的值~
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已知x^-XY=60,XY-Y^=40,求代数式X^-Y^和2X^-5XY+3Y^的值~已知x^-XY=60,XY-Y^=40,求代数式X^-Y^和2X^-5XY+3Y^的值~已知x^-XY=60,X
已知x^-XY=60 ,XY-Y^=40,求代数式X^-Y^和2X^-5XY+3Y^的值~
已知x^-XY=60 ,XY-Y^=40,求代数式X^-Y^和2X^-5XY+3Y^的值~
已知x^-XY=60 ,XY-Y^=40,求代数式X^-Y^和2X^-5XY+3Y^的值~
X^-Y^=60+40=100
2X^-5XY+3Y^
=2(x^-xy)-3(xy-y^)
=2*60-3*40
=0
X^-Y^=x^-xy+xy-y^=60+40=100;
2X^-5XY+3Y^=2(x^-xy)-3(xy-y^)=2*60-3*40=120-120=0;
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已知x^-XY=60 ,XY-Y^=40,求代数式X^-Y^和2X^-5XY+3Y^的值~
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