1.(2x-3)(x-2)-2(x-1)^2 2.【(xy+2)(xy-2)-2x^2y^2+4]/xy
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1.(2x-3)(x-2)-2(x-1)^2 2.【(xy+2)(xy-2)-2x^2y^2+4]/xy
3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)
3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)
1.(2x-3)(x-2)-2(x-1)^2
原式=2x²-7x+6-2x²+4x-2
=-3x+4
2.[(xy+2)(xy-2)-2x^2y^2+4]/xy
原式=[-x²y²]/xy
=-xy
3.8x^6-6x^6+12x^5+6x^4
原式=2x^4(x²+6x+3)
4.(x+2)(y-3)-(x-1)(y+2)
原式=xy-3x+2y-6-xy-2x+y+2
=-5x+3y-4
5.(a-6)(a^2+b^2)(a+b)
原式=(ab²-5a²-6b²)(a+b)
=a²b²+ab³-5a³-5a²b -6ab²-6b³
6.(x+2y)^2(x-2y)^2
原式=.(x²+4xy+4y²)(x²-4xy+4y²)
=x^4-4x³y+4x²y²+4x³y-16x²y²+16xy³+4x²y²-16xy³+16y^4
=x^4-8x²y²+16y^4
7.(a-2b+3c)(a-2b-3c)
原式=[(a-2b)+3c][(a-2b)-3c]
=(a-2b)²-(3c)²
=a²-4ab+4b²-9c²
原式=2x²-7x+6-2x²+4x-2
=-3x+4
2.[(xy+2)(xy-2)-2x^2y^2+4]/xy
原式=[-x²y²]/xy
=-xy
3.8x^6-6x^6+12x^5+6x^4
原式=2x^4(x²+6x+3)
4.(x+2)(y-3)-(x-1)(y+2)
原式=xy-3x+2y-6-xy-2x+y+2
=-5x+3y-4
5.(a-6)(a^2+b^2)(a+b)
原式=(ab²-5a²-6b²)(a+b)
=a²b²+ab³-5a³-5a²b -6ab²-6b³
6.(x+2y)^2(x-2y)^2
原式=.(x²+4xy+4y²)(x²-4xy+4y²)
=x^4-4x³y+4x²y²+4x³y-16x²y²+16xy³+4x²y²-16xy³+16y^4
=x^4-8x²y²+16y^4
7.(a-2b+3c)(a-2b-3c)
原式=[(a-2b)+3c][(a-2b)-3c]
=(a-2b)²-(3c)²
=a²-4ab+4b²-9c²
(xy-x^2)乘以(xy)/(x-y)
计算3xy[2xy-x(y-2)+x-1]
(-3x^y+2xy)-( )=4x^+xy
(x^2+xy/x-y)/(xy/x-y)计算
(x+y-2xy)(x+y-2)+(1-xy)²
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
计算:3xy[2xy-x(y-2)+x]
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2