1.若4x-3y=6,3x+2y=10,则14x-2y的值为——?2.先化简,在求值：（a-2）（a+2）-a（a-2）,其中a=-1.

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)-4(x-y)=4 {x+y/2 + x-y/6=1 （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 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610（x-y)=3(x+y)+156(x+y)=4(2x-y)+16 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610（x-y)=3(x+y)+156(x+y)=4(2x-y)+16分开的。 若5x+3y=3x+4y=x+2y+6,则x+y=___ 3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组 3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2 解方程组,x+y/2=3x-2y=10+6x+y/4, 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值