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2x-y=3①2kx+(k+1)y=15②x+区认挥院算板青解夫y=0③①+③3x=3x=1④③-④y=-1⑤④⑤代入②2k-(k+1)=15k=16方程组解:(x,y,k)=(1,-1,16)∴k=16无副题
先解方程:2x问答-y=3①2kx+(k+1)y=15②场兵住系销由①得:y=2x-3把y=2x-3代入②得:2kx+(k+1)(2x-3)=15化简:2kx+(2kx-3k+2x-3)=15(4k+2常财英)x-3k-3=15x=(18+3k)/(4k+2)把x=(18+3k)/(4k+2)代入①得:2(18+3k)/(4k+2)-y=3y=2(18+才超功利影迫苏离课婷3k)/(4k+2)-3粉方程组的解互为相反数,即:x=-y所以,(18+3k尼并议打曲密跳充住高细)/(4k+2)=-2(18+宗宪守祖呼座游阻3k)/(4k+2)+3化简:3(18+3k)/(4k+2)=318+3k=4k+2k=18-2=16所以,k的值是16
解:解互为相反数,y=-x将y=-x代入2x-y=32x+x=3x=1将x=1,y=-1,代入2kx+(k+1)y=152k-(k+1)=152k-k-1=15k=16
2x-y=3,2kx-ky=3k①2kx+(k+1)y=15②②-①:(k+1)y+ky=15-3k(k+2)y=15-3ky=(15-3k)/(k+2)2x=3+(15-3k)/(k+2)=(3k+6+15-3k)/(k+2)=21/(k+2)给市神呢研讲诗x=21/(2k+4)互为相气值劳按足反数,则x+y=0。即(15-3k)/(k+2)+21/(2k+4)=0(30-余6k)/(2k+4)+21/(2k+4)=0(30-6k+21)/(2k+4)=051-6k=06k=51k=17/22k+4=2*17/2+4=17+4=21≠0∴k的值是17/2