y等于x/x加6
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2再答:再答:记得给奖励喔
(x/3+x/6+y/2)×6=6×62x+x+3y=363(x+y)=36x+y=12再问:(x/3+x/6+y/2)×6=6×6为什么前面×6了,后面还有6×6?再答:方程两边同时乘6
x^2-2x+y^2+6y+10=0x^2-2x+1+y^2+6y+9=0(x-1)^2+(y+3)^2=0x-1=0,y+3=0x=1,y=-3(x-y)/(x+y)=4/(-2)=-2
x^2+y^2-2x+6y+10=0(x-1)^2+(x+9)^2=0欲等式成立x=1,y=-9于是x+y=-8
题在哪
6x+4x=100,x=10y不能确定
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
X²-Y²=12,即(X+Y)(X-Y)=12.又X+Y=6,则X-Y=2.故(X+Y)+(X-Y)=6+2,即2X=8,X=4;所以,Y=6-X=2.
x²-y²=(x+y)(x-y)=6×5=30
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
x^2减6xy加9y等于0.则x:y等于_3:1___.
x=8,y=15.(诚心为你解答,给个好评吧)
x/y+y/x=(x²+y²)/xyx²+y²=(x+y)²-2xy=36-16=20原式=20/8=2.5
2x-y=6,在等式的两边同时乘以-1,得到y-2x=-6所以:4-2x+y=4-6=-2
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
(x-y)(x+y)+(x-y)(x+y)=2*(x-y)(x+y)=2(x^2-y^2)=2x^2-2y^2
根据(x+y)2=x2+y2+2xy,可得x2+y2=13
根据题目:3x+y=68①x+3y=44②(①+②)÷4x+y=28x=(68-28)÷2=20y=28-20=8