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3x 2 5xy 2y 2 x 9y 4

原式=(3x-y)(x+2y)+x+9y-4 =(3x-y)(x+2y)-(3x-y)+4x+8y-4 =(3x-y)(x+2y-1)+4(x+2y-1) =(3x-y+4)(x+2y-1)

答案如下:

答案如下:

用双十字相乘法分解因式: 3x²+5xy-2y²+x+9y-4 =(3X-Y+4)(X+2Y-1)。

使用两次十字相乘法 如下图:

x-2=-9(1)y+z=32(2)z+x=47(3)解:由(1)得,x=-7把x=-7代入(3)得,z+(-7)=47解得,z=54把z=54代入(2)得,y+54=32解得,y=-22∴原方程组的解是:x=-7y=-22z=54

x-3xy-10y+x+9y-2 =(x-5y)(x+2y)+x+9y-2 =(x-5y+2)(x+2y-1) x-y+5x+3y+4 =[x(3x+5y)+y(5x+3y)][x(3x+5y)-y(5x+3y)] =(3x+5xy+5xy=(3x+10xy+3y)(3x-3y) =3(3x+10xy+3y) xy+y+x-y-2 =(xy+x)+(y-y-2) =x(y+1)+(y+1)(y-2) =(y+1)[x+(y-2)]

整式:-(2a2-2a)3(3a-a2), =6a^2(a-1)(a-3) =6a^2(a^2-4a+3) =6a^4-24a^3+18a^2 2(4x2y+-5xy2) =8x^2y+10x^2 ,3(2x2-2x-1)-2(2x2-x-7), =6x^2-6x-3-4x^2+2x+14 =2x^2-4x+11 2a-[-3b-3(3a-b)] =2a-[-3b-9a+3b] =2a+9a =11a ,(1/3a3-2a-6)-1/2(1/2...

会的,那是因为你的硬盘在频繁的进行读写操作,但影响是不是很明显

若3x的3m5n9次方+9y的4m-2n+3次方=5是二元一次方程求mn的值 解: 由题意可得: 3m+5n+9=1 4m-2n+3=1 联立解得: m=-1 n=-1

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