2x分之1-x y分之1-x y分之1乘以(2x分之x y-x-y
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2分之3X^(3)Y-6X^(2)Y^(2)+9XY^(3)
=(2X/3Y)*(3X/4Y)*(4/xy)=(2x*3x*4)/(3y*4y*xy)=2x/(y^3)
绝对算不出来再答:如果是一道题发图咯再问:x平方减xy加y平方分之x平方加2xy加y平方他给你条件是y分之x等于2分之1xy再问:吧xy无视掉再答:马上再答:化成Y等于2X在带入再问:然后怎么样再答:
可以先设xy=t原式=[4(t-1)^2-(t+2)(2-t)]/(1/4*t)=4(4t^2-8t+4-2t+t^2-4+2t)/t=4(5t^2-8t)/t=(20t-32)/t=20-32/t将
3xy-[2xy-2(xy-2分之3xy)+xy]+3xy=6xy-[2xy-2xy+3xy+xy)=6xy-4xy=2xy=2×3×3分之1=2
(1)(xy-x²)除以xy分之x²+y²-2xy乘x²分之x-y=x(y-x)×xy/(x-y)²×(x-y)/x²=-y(2)先化简:(
1/x+1/y=-2则(x-xy+y)/(x+xy+y)分子分母同除以xy=(1/x+1/y-1)/(1/x+1/y+1)=(-2-1)/(-2+1)=3
您好:(1)-2分之1xy(3y²-2xy+3x²y)=-3/2xy³+x²y²-3/2x³y³(2)已知x=4,y=8分之1,求
原式=-x²y³+3x²y³=2x²y³
(x+2y-3xy)-(-2x-y+xy)=x+2y-3xy+2x+y-xy=(1+2)x+(2+1)y-(3+1)xy=3x+3y-4xy=3(x+y)-4xy=3*1/2-4*(-1/2)=3/2
原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)
(3x^2+2xy)/xy-(2x^2-xy)/xy=(3x^2+2xy-2x^2+xy)/xy=(x^2+3xy)/xy=x(x+3y)/xy=(x+3y)/y
(2分之1x平方y—2xy+y平方)*3xy=1/2x²y*3xy-2xy*3xy+y²*3xy=3/2x³y²-6x²y²+3xy&sup
x-y分之xy=-3分之1xy分之(x-y)=-3x-y=-3xyx-2xy-y分之2x+3xy-2y=(-6xy+3xy)/(-3xy-2xy)=3/5
[4(xy-1)^2-(xy+2)(2-xy)]除以4分之1xy=[4x^2乘以y^2-8xy+4-(4-x^2y^2)]除以4分之1xy=(4x^2乘以y^2-8xy+4-4+x^2y^2)除以4分
由已知条件可得:x-y=-4xy,(也就是在等式两边乘xy后整理,即可),代入所求的式子里分母为-4xy+7xy,即3xy;分子为-4xy-2xy,即-6xy,化简得-2
题目不清楚..(分之1/2倍)?再问:根号下2xy分之1除以2倍根号x乘根号下xy分之2再答:^2为平方;/为分号;√为根号。1/√2xy÷2√x×2/√xy=√2xy/2xy×√x/2x×2√xy/
单项式有:3分之b²,-2,共2个.多项式有:2分之xy+3,5分之ab+x,共2个.整式有:3分之b²,2分之xy+3,-2,5分之ab+x,共4个.
[(xy-2)(-xy-2)-4(xy-1)^2]除以(-xy)=[-x²y²+4-4(x²y²-2xy+1)]÷(-xy)=(-x²y²+
分子上应写:(x-1)²或者x²-2x+1再问:怎么书面表达呢?能否详细一些,谢谢再答:希望你及时采纳!!!!!