x等于3y z等于x减3x加y加z分之3x减y加z-搜答案-智慧作业帮

2再答：再答：记得给奖励喔

x^2+2xy+y^2=25===>(x+y)^2=5^2===>x+y=±5(x-y)^2-3x+3y+2=0===>(x-y)^2-3(x-y)+2=0===>[(x-y)-1]*[(x-y)-2

x=19/14y=-3/4z=13/4再问：求过程再答：程式一：x/2+y=z/2程式二：x-y/3=5程式三：x+y-z/2=33元一次方程从程式一得到x=z-2y把x=z-2y放入程式2和程式3就

x=2y+3(1)3x+y=6(2)把(1)式代入(2)得:3(2y+3)+y=66y+9+y=67y=-3y=-3/7把y=-3/7代入(1)式得:x=15/7综上：x=15/7y=-3/7

后半句意思都没表达清楚求采纳

X等于51/14Y等于1/7Z等于73/14

已知x加y等于1,则3减2x减2y=3-2(x+y)=3-2×1=3-2=1;您好,很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,如果满意记得采纳如果有其他问题请采

(x-1)(x+2)(x+3)(x+6)+20=0(x-1)(x+6)(x+2)(x+3)+20=0(x^2+5x-6)(x^2+5x+6)+20=0(x^2+5x)^2-36+20=0(x^2+5x

x²+y²=x²+2xy+y²-2xy=(x+y)²-2xy=3²-2×1=7

4y-3x=0,x/y=4/3(x+y)/y=4/3+1=7/3

∵x-y=5,y-z=3,∴x-z=8由x-y-5,得：x2-2xy+y2=25同理,可得：y2-2yz+z2=9x2-2xz+z2=64三式相加,得：2x2+2y2+2z2-2xy-2yx-2xz=

X比y3：2=300：200所以y=200因为5z=300z=60则X=180Y=120所以X-Y=180-120=60

x^2-y^2=(x+y)*(x-y)=-1*(-3)=3

31,x=7,y=1.

∵（y+3)+(x-4）i=0∴y+3=0x-4=0即x=4,y=-3

x+y=19x-y=8.6两式相加2x=27.6x=13.8y=5.2

X+y=55X-y=13X=3y=5再答：点错了y=2

3x-y+4x=(3+4)x-y=7x-y

(x-y)(x+y)+(x-y)(x+y)=2*(x-y)(x+y)=2(x^2-y^2)=2x^2-2y^2

3x+2y=542x+3y=465x+5y=54+46=100x+y=20