5x5-15x3y-20xy2翻译:5x的5次方减15x的三次方y减20xy的平方3a2b2-17abxy+10x2y2那些2就是平方大家应该能看懂吧!
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5x5-15x3y-20xy2翻译:5x的5次方减15x的三次方y减20xy的平方3a2b2-17abxy+10x2y2那些2就是平方大家应该能看懂吧!
x.y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3).y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)的值都是常数?
已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.14.已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.0 - 解决时间:2007-5-19 21:57 已知x、y均为实数,且满足xy+x+y=17,x2y
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已知x-y=1,求代数式x4-xy3-x3y-3x2y+3xy2+y4
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已知(3x+2y-5)²与|5x3y-8|互为相反数,
已知(3x-2y-5)²与|5x3y-8|互为相反数,
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20X(x-5)+30X5=570怎么解
已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.
化简(2x-3y)²-(2x-3y)·(2x3y)+y(6y+5x)
已知:(x+2)2+|y+1|=0,求5xy2-{2x2y-[3xy2-(4xy2-2x2y)]}的值
4x=(5+x)x5
已知x+y=5,xy=3,求代数式x3y-2x平方y平方+xy3
14.已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.
先化简,再求值:3x2y2-[5xy2-(4xy2-3)+2x2y2],其中x=-3,y=2.