3x-4y=12

已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y已知2x-y/x+3y=2,求代数式

已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值已知2x-y/x+3y=2,求代

已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值已知2x-y/x+3y=2,求代

21/(x+y)+4/(x-y)=12/(x+y)+7/(x-y)结果为(x+y)/(x-y)=3求过程!21/(x+y)+4/(x-y)=12/(x+y)+7/(x-y)结果为(x+y)/(x-y)

(x-y)(x-2y)+(x+2y)(x-3y)-2(x-3y)(x-4y)=(x-y)(x-2y)+(x+2y)(x-3y)-2(x-3y)(x-4y)=(x-y)(x-2y)+(x+2y)(x-3

填空题x+y/4=x-y/6=3x+12y+5/8x=y=填空题x+y/4=x-y/6=3x+12y+5/8x=y=填空题x+y/4=x-y/6=3x+12y+5/8x=y=还是只要答案?只要答案的话

8x-8y-3x-3y=-12,6x+6y-8x+4y=168x-8y-3x-3y=-12,6x+6y-8x+4y=168x-8y-3x-3y=-12,6x+6y-8x+4y=16x=2,y=2

解方程组：x+y/2+x-y/3=64(x+y)-5(x-y)=12解方程组：x+y/2+x-y/3=64(x+y)-5(x-y)=12解方程组：x+y/2+x-y/3=64(x+y)-5(x-y)=

解方程组{2(x-y)/3-x+y/4=-16(x+y)-41(x-y)=12解方程组{2(x-y)/3-x+y/4=-16(x+y)-41(x-y)=12解方程组{2(x-y)/3-x+y/4=-1

8（x-y)=3（x+y)-126（x+y)=4（2x-y)+168（x-y)=3（x+y)-126（x+y)=4（2x-y)+168（x-y)=3（x+y)-126（x+y)=4（2x-y)+16化

8（x-y)=3（x+y)-126（x+y)=4（2x-y)+168（x-y)=3（x+y)-126（x+y)=4（2x-y)+168（x-y)=3（x+y)-126（x+y)=4（2x-y)+16x

4(x+2)=1-5y4(x+y)-3(x-y)=124(x+2)=1-5y4(x+y)-3(x-y)=124(x+2)=1-5y4(x+y)-3(x-y)=124(x+2)=1-5y4x+8=1-5

4-12(x-y)+9(x-y)²=(2-3x+3y)²4-12(x-y)+9(x-y)²=(2-3x+3y)²4-12(x-y)+9(x-y)²=(

3y+12=x4y+5=x,求x,y3y+12=x4y+5=x,求x,y3y+12=x4y+5=x,求x,y由题意：3y+12=4y+5y=12-5y=7所以：x=3y+12=3×7+12=33x=3

5x+y=12x-3y=4求x和y5x+y=12x-3y=4求x和y5x+y=12x-3y=4求x和y由2式得x=4+3y，带入1式得20+16y=12∴y=-0.5,x=2.5x=5/2y=1/2

若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值.若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值.

若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=若x-2y=5,则式子12-x+2y=.以知3x-4

三元一次方程组解法4x+y-z=12x+y+z=263x+2y+z=-5x-y=1x-y+5z=12x-y+z=18急急、、、、、、、、、、三元一次方程组解法4x+y-z=12x+y+z=263x+2

已知有理数x,y,z满足x+y/3=y+z/4=z+x/5,且x+y+z=12,则x=_____,y=——,z__________已知有理数x,y,z满足x+y/3=y+z/4=z+x/5,且x+y+

(3x-2y)(4x-y)-10x+10y-12=(3x-2y+2)(4x-y-6)是怎么来的在什么情况下用十字相乘(3x-2y)(4x-y)-10x+10y-12=(3x-2y+2)(4x-y-6)