xy=4 x-y=-7.5 则3(xy-2/3y)-1/2(2x=4xy)-(-2x-y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/01 12:06:01
![xy=4 x-y=-7.5 则3(xy-2/3y)-1/2(2x=4xy)-(-2x-y)](/uploads/image/z/438457-49-7.jpg?t=xy%3D4+x-y%3D-7.5+%E5%88%993%EF%BC%88xy-2%2F3y%29-1%2F2%282x%3D4xy%29-%28-2x-y%29)
xKJ@2ĶJYsA A7Y8B|"f@ŕ1ۤq5W j
w=JGFN4}r220>(u~rp$7Yl^>|=zG]H0.q388VJg CAvC(I$:3[}.#AҌ7<)cG
sm5W|huungK\My,ڗۺ<
\
xy=4 x-y=-7.5 则3(xy-2/3y)-1/2(2x=4xy)-(-2x-y)
xy=4 x-y=-7.5 则3(xy-2/3y)-1/2(2x=4xy)-(-2x-y)
xy=4 x-y=-7.5 则3(xy-2/3y)-1/2(2x=4xy)-(-2x-y)
原题应该为3(xy-2/3y)-1/2(2x+4xy)-(-2x-y)
=3xy-2y-x+2xy+2x+y
=5xy+x-y
=20-7.5
=12.5
xy=4,x-y=-7.5
x-4/x=-15/2
x^2+15/2*x-4=0
2x^2+15x-8=0
(2x-1)(x+8)=0
x=1/2或x=-8
y=8或y=-1/2
式子有点看不懂,只好自己核算了
已知x+y=4,xy=3,则-xy-xy=
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
(-3x^y+2xy)-( )=4x^+xy
当x-y=2xy时,求4x-3xy-4y/xy
xy=4 x-y=-7.5 则3(xy-2/3y)-1/2(2x=4xy)-(-2x-y)
已知x+y=3,xy=1,则4x+3xy+4y=
已知xy=-3,x+y=-4,则x²+3xy+y²=?
已知x/y=3/4 ,则3xy-2y/2x+4xy=?
|x|/x+y/|y|+xy/|xy|=
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得:x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎
3xy+xy+3+4xy-7化简,已知x=5,y=6
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)=
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
若xy/x+y=2,则3x-xy+3y/-x+3xy-y=