-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^

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-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^

-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^
-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项
-4x^2y-8xy^2+2x^2y-3xy^2

3x^2-1-2x-5+3x-x^2

-0.8a^2b-6ab-1.2a^b+5ab+a^2b

5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y

合并同类项

求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2.

如果x^2+my-12与多项式nx^2-3y+6 的和中不含有x、y,试求mn的值

-4x^2y-8xy^2+2x^2y-3xy^2 合并同类项-4x^2y-8xy^2+2x^2y-3xy^2 3x^2-1-2x-5+3x-x^2 -0.8a^2b-6ab-1.2a^b+5ab+a^2b 5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y 合并同类项 求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2. 如果x^
-4x^2y-8xy^2+2x^2y-3xy^2
=-2x²y-11xy²
=-xy(2x+11y)
3x^2-1-2x-5+3x-x^2
=2x²+x-6
=(2x-3)(x+2)
-0.8a^2b-6ab-1.2a^b+5ab+a^2b
=-a²b-ab
=-ab(a+1)
5yx-3x^2y-7xy^2+6xy-12xy+7xy^2+8x^2y
=-xy+5x²y
=xy(5x-1)
求代数式1/2(a-b)^2+1/4(a+b)-1/3(a-b)^2-1/5(a+b)的值,其中a=-1 b=1/2.
代数式=1/6(a-b)²+1/20(a+b)=1/6(-1-1/2)²+1/20(-1+1/2)=3/8-1/40=7/20
如果x^2+my-12与多项式nx^2-3y+6 的和中不含有x、y,试求mn的值
x²+my-12+nx²-3y+6=(n+1)x²+(m-3)y-6
根据题意
n+1=0
n=-1
m-3=0
m=3
nm=-3

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 化简2(x²y+xy)-3(x²y-xy)-4x²y 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 （-3x^y+2xy)-( )=4x^+xy (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² x平方-2xy-3y平方+8y-4 X^Y-2XY^2+y^3 计算:2xy/(x+y)².(x+y)/4y x*x-xy=-3,2xy-y*y=-8,求2x*x-4xy+y*y的值 3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y (x-y-x+y/4y^2)(x+y-x+y/4x^2)/(3(x+y)-x-y/8xy)拜托各位大神(x-y-x+y/4y^2)(x+y-x+y/4x^2)/(3(x+y)-x-y/8xy)详细, x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² （12x^2y-8xy^2+16xy）/-3x+2y-4=?