【数学计算】1,4,5,6,4的方差是() 化简求值:(xy-x²)÷ x²-2xy+y²
【数学计算】1,4,5,6,4的方差是() 化简求值:(xy-x²)÷ x²-2xy+y²
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
化简求值:[(xy-2)²+4xy-4]÷(xy),其中x=10,y=1/25
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
化简求值:[4(xy-1)²-(xy+2)(2-xy)]÷ -1/4 xy,其中x=-2,y=1/5
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy
化简求值:已知x+4y=-1,xy=5,求(6xy+7y)+【8x-(5xy-y+6x)】的值
初一数学先化简再求值:4x²y-[6xy-3(4xy-2)-x²y]+1,其中x=2,y=-1/2
化简求值[1-(2x/x+y)]÷ (x²-2xy+y²/3x+3y)+(x²+xy/x&
化简求值(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)其中
化简求值(x+y)(x-y)-(x-y)²-6x²y除2y+(2xy)²除(-4xy)其中