化简 2(xy-xy²+3)-(-4xy²+xy-1) 其中,x等于--4,y等于-3
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:综合作业 时间:2024/07/28 07:06:45
化简 2(xy-xy²+3)-(-4xy²+xy-1) 其中,x等于--4,y等于-3
![化简 2(xy-xy²+3)-(-4xy²+xy-1) 其中,x等于--4,y等于-3](/uploads/image/z/19549509-69-9.jpg?t=%E5%8C%96%E7%AE%80+2%EF%BC%88xy-xy%26%23178%3B%2B3%EF%BC%89-%EF%BC%88-4xy%26%23178%3B%2Bxy-1%EF%BC%89+%E5%85%B6%E4%B8%AD%2Cx%E7%AD%89%E4%BA%8E--4%2Cy%E7%AD%89%E4%BA%8E-3)
2(xy-xy²+3)-(-4xy²+xy-1)
=2xy-2xy²+6+4xy²-xy+1
=xy+2xy²+7
=-4*(-3)+2(-4)(-3)^2+7
=12-72+7=-53
=2xy-2xy²+6+4xy²-xy+1
=xy+2xy²+7
=-4*(-3)+2(-4)(-3)^2+7
=12-72+7=-53
(5xy-2x的平方)-3xy-2(3xy-4x的平方)其中x等于1,y等于-2?
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
(xy^-1)²*(-xy^4)^-1*(-y²x^-1)³等于
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
(1)先化简,再求值:[4(xy-1)²-(xy+2)(2-xy)]÷1/4xy,其中x=-2,y=1/5.
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2