6x-4y=37 3x+4y=-5 用加减消元法解方程组

解方程组 3x加2y加5z=2 x-2y-z=6 4x加2y-7z=30 (x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=－2 0 求x,y分可以加. x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 若实数X,Y满足X的2次方加4Y的2次方加4X加4Y加5=0.求X,Y 求(x加y)(2x减y)减(x加2y)(x减2y)的值,其中x等于3,y等于4求(x+y)(2x-y)-(x+2y)(x-2y)的值,其中x=3,y=4用平方差的公式计算 已知X,Y为实数,且X=根号1-3Y加根号3Y-1加2,求6Y-4X的直 若实数x、y满足x二次方加4x加y二次方减6y加13=0,求x、y的值 x分之一加y分之一=3,求3x-4xy加3y分之x+2xy+y 若4X的平方加Y的平方减4X加10Y加26=0,试求6X-5分之1 y {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 已知X+Y=-4,怎样求二分之一X+Y-4X-Y+3X+Y-二分之三X+Y+X-Y的值二分之一乘以括号X+Y加-4乘以括号X-Y加3乘以括号X-Y负三分之二乘以括号X+Y加括号X－Y的值 （5x+3y)(3y-5x)-(4x-y)(4y+x)= 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 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11