X y等于42X等于3-2到X等于多少y等于多少?作业帮
来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 23:24:17
(2X-3Y-2XY)-(X-4Y+XY)=2X-3Y-2XY-X+4Y-XY=X+Y-3XY因为x加y等于110,xy等于33所以原式等于:110-33*3=11
2x(x-y)/2x=x-y
x+2绝对值+(y-3)的平方=0则x+2=0,y-3=0则x=-2,y=3则X的绝对值+2=2+2=4xy÷x平方-y的平方=-6÷4-9=-10又2分1
2x的四次方乘y的三次方减x的三次方乘y的四次方.=x³y³(2x-y)=(xy)³(2x-y)=2³x1/3=8/3在右上角点击【评价】,然后就可以选择【满意
4xy加5x²y加yx²再问:谢谢了,
不知道你的计算式是不是我理解这样的:x²+xy=3;y²+xy=-2;求2x²-xy-3y²=?先看你要求的计算式里面x²的系数是2而y²的
(5xy-2x^2)-3xy-2(3xy-4x^2)=5xy-2x^2-3xy-6xy+8x^2=-4xy+6x^2x等于1,y等于-2原式=-4*1*(-2)+6*1^2=8+6=14
原式可化简为xy(-x^2-y^2+2xy)=xy(-x^2-y^2-2xy+4xy)=xy(-(x+y)^2+4xy)注:-x^2-y^2-2xy=-(x+y)将1,2式代入得,3*(-(-5)^2
(x+y)(x-y)-(x的2次方-3xy)=x²-y²-x²+3xy=3xy-y²=3x2x(-1/2)-(-1/2)²=-3-1/4=-3.25
题出错了吧
2(x+xy)-[(xy-3y)-x]-(-xy)=2x+2xy-xy+3y+x+xy=3x+3y+2xy=3(x+y)+2xy=3*(-2)+2*3=0
3x²-xy+y²=101-xy+4y²=421-2得3x²-3y²=6x²-y²=2选B
等于2(x+y)^2-xy再问:详细些,再答:2x^2+3xy+2y^2=2x^2+4xy+2y^2-xy=2(x^2+2xy+y^2)-xy=2(x+y)^2-xy
(x+y)^2=x∧2+y∧2+2xy=9x∧2+y∧2=9-2×(-9)=27
1/x-1/y=3则x-y=-3xyx-3xy-y/2x-xy-2y=(-3xy-3xy)/(-6xy-xy)=6/7
|x-y|=4,xy=-3(x+y)^2=(x-y)^2+4xy=14-12=2x+y=根2,-根2xy^2+x^2y=xy(x+y)=-3根2,3根2再问:(x+y)^2=(x-y)^2+4xy=1
设x+y=axy=b,则b/a=3b=3a所以-X+3XY-Y分之2X-3XY+2Y可以写成(2a-3b)/(3b-a)=-7/8
因式分解原式=[x(x-2)]/[-y(x-2)]=-x/y
∵xy<0∴1、x0x的绝对值等于2,x=-2y的绝对值等于3,y=3则xy等于-2*3=-62、x>0,y