3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于
来源:学生作业帮助网 编辑:六六作业网 时间:2024/10/06 19:39:40
3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于3x^2y-[2xy-2
3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于
3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于
3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于
先化简,再求值
3x²y-[2xy-2(xy-2/3x²y)+xy]
=3x²y-2xy+2(xy-2/3x²y)-xy
=3x²y-2xy+2xy-4/3x²y-xy
=5/3x²y-xy
=xy(5/3x-1)
将x=3,y=-1/3 代入
原式=xy(5/3x-1)=3×(-1/3)(5/3×3-1)=-1×(5-1)=-4
∵x=3,y=-3/1(此处应为:y=-1/3)
3x^2y-[2xy-2(xy-2/3x^2y)+xy]=3x²y-2xy+2xy-4x²y/3-xy=5x²y/3-xy=5×3²×(-1/3)/3-3×(-1/3)=-5+1=-4
3x²y-[2xy-2(xy-2/3x²y)+xy]
=3x²y﹣3x²y﹣xy
=﹣xy
=﹣3×﹙﹣1/3﹚
=1
2x²y-3(2xy-xy)-xy
3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程
计算:3xy(x²y-xy²+xy)-xy²(2x-xy+2x)
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
(X-3xy+4xy-y)-[-2x-2(xy-3/2xy)-y]+6xy的过程
计算:3xy[2xy-x(y-2)+x]
计算3xy[2xy-x(y-2)+x-1]
(-3x^y+2xy)-( )=4x^+xy
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
x^2-xy-6y^2+3xy+y+2
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x,
因式分解:(2x-y)(x^2+xy-2y^2) xy(x^2-xy)(-3xy^2)
化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]}
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)