5x+10y=14

4x-2*(10-x)-10=5y-3*(10-y)x+y=14 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 5 x²+2y²+2xy-14x-10y+17=0求x,y请用初中知识5 x²+2y²+2xy-14x-10y+17=0求x、y x1:4x-3y=8;y=7-5x;2:2x-7y=8,3x-8y-10=0;3:4x-y=-1;4:5x-10y+15=0;5:2x-4y=6,3x+2y=27;6:3y=x+5,2x+5y=231：2x+3y=7,3x-5y=1;2:3x+5y=5,3x-4y=23;3:3x+5y=5,3x-4y=23;4:5x+y=7,3x-y=1;5:4x-3y=5,4x+6y=14;6:6x+7y=5,6x-7y=19;7:0.5x-3y=-1,-二分之一x+5y=3 x+y=5!x-y=-10 x=?,y=?x+y=5!x-y=-10x=?,y=? 5x+10y=14 5x+10y=14 3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5 用代入法解下列方程组 ①｛y=1-x 3x+2y=5 ②｛2x-y=5 3x+4y=2 ③｛x-y-3=0 3x-8y=14 ④｛④｛2x-7y=8 3x-8y-10=0⑤｛x=3y+7/2 x=2y+8/3⑥｛3x=5y 4y-3x+9=0急 用消元法解下列方程： 1.3x-2y=8,4x+4y=14 2.2x-5y=-10,3x+7y=14 2元1次方程组 10x+14y 5x-3y+3010x+14y=160 5x-3y=30 三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31 若实数X,Y满足方程5X²-12XY+10Y²-6X-14Y+13=0,则X=?Y=? 如果x+2y=3 7x+5y=-1,那么(4x+8y)/3+(14x+10y)/2=?急! {2(x+y)=8,3x+5(x+y)=111、{ 2(x+y)=8,3x+5(x+y)=112、{ 3x+10y=14,10x+15y=323、{3x-y=7,5x+2y=8.用代入法解下列方程组 ,