填空题 x+y/4=x-y/6=3x+12y+5/8 x= y=

填空题 x+y/4=x-y/6=3x+12y+5/8 x= y= x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 填空：x-y/x+y=( )/x^2-y^2 初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y (-x+6):(x-y);(4x+y)=3;14:1,求x+y的值. 填空：1.（1）2m（y-x）^2=（ )(x-y)^2填空：1.（1）2m（y-x）^2=（ )(x-y)^2（2）-2m(y-x)^3=( )(x-y)^3( 3 ) (x+y)(y-x)=-(x+y)( )( 4 ) -m(y-x^2)=m( ) 解二元一次方程组：3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1 填空x+y-z=x+( )=x-( )填空x+y-z=x+()=x-() 填空(1/3x+?)(?+2y)=4Y^2-1/9x^2 (1)15x³y5次方(y-x)³分之12x²y(x-y)4次方(2)4x²-4分之1-2x+x²下面还有(3)x²+10x-24分之2x²-2x-4 （4）解答题：已知x-3y+4=0,求分式2x+4y分之x²-xy-6y²的值（5）填空a-1=a+3分之（ (1)15x³y5次方(y-x)³分之12x²y(x-y)4次方 (2)4x²-4分之1-2x+x²下面还有(3)x²+10x-24分之2x²-2x-4 （4）解答题：已知x-3y+4=0,求分式2x+4y分之x²-xy-6y²的值（5）填空a-1=a+3分之 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 {3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1