Y1与X加1成正比例,Y2与X减1成正比例,Y等于Y1加Y2,当X等于
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∵y1与3x成正比例y2与(x+5)成正比例∵y1=k1×3xy2=k2(x+5)(k1k2≠0)∵y=2y1-y2=6k1-k2(x+5)∴12=6k1-6k2-2=-6k1-4k2∴k1=1k2=
1)设y1=k1(x+1),y2=k2(x-2)y=y1+y2=k1(x+1)+k2(x-2)=(k1+k2)x+k1-2k2x=2,y=9,则9=2(k1+k2)+k1-2k2得k1=3x=3,y=
设y1=k1x²,y2=k2(x-2)∵y=y1+y2∴y=k1x²+k2(x-2)根据题意得5=k1-k211=k1-3k2∴k1=2k2=-3∴y=2x²-3(x-2
,y1与x-1成正比例,y2与x正比例可设y1=k(x-1),y2=tx则y=y1-y2=k(x-1)-tx当X=2时,y=4;当x=-1时,y=-5则4=k-2t-5=-2k+t解得k=2,t=-1
设y1=k1x,y2=k2(x+1),则y=k1x-2k2(x+1),根据题意得3=k1−4k25=2k1−6k2,解得:k1=1k2=−12.∴y=x-2×(-12)(x+1)=2x+1.
因为y1与x成正比例,y2与x减1成正比例所以可设y1=ax,y2=b(x-1)则y=ax+b(x-1)将两个点的坐标代入有:a+b(1-1)=32a+b(2-1)=7解方程组得:a=3b=1所以y=
y1=m(x+1)y2=nx*x且y=y1+y2;当x=1,y=2时(将x=1,y=2代入式子中)y=y1+y2得到2=2m+n当x=0,y=2时y=y1+y2得到2=m+0m=2,n=-2所以y=2
y1与x成正比例,设y1=k1·x;y2与x减1成正比例,设y2=k2·(x-1)∴y=y1+y2=k1·x+k2·(x-1)将x=1,y=3;x=2,y=7代入,得{k1=32k1+k2=7解得:k
y=y1+y2;y1=k1x;y2=k2/x;所以y=k1x+k2/x由已知条件可知:k1+k2=4and2k1+k2/2=5得知k1=k2=2所以问题1:y=2x+2/x问题2:当x=4时,y=17
设y1=2mx,y2=n(x+1),(m,n均为常数,m≠0,n≠0),则y=2mx+n(x+1)分别把x=1,y=2;x=-2,y=3代入y=2mx+n(x+1)得关于m,n的方程组:2=2m+2n
∵y1与x+1成正比例,∴y1=k1(x+1),∵y2与x-1成正比例,∴y2=k2(x-1),∵y=y1+y2,∴y=k1(x+1)+k2(x-1),∵当x=2时,y=9;当x=3时,y=14,∴k
设y1=kx,y2=m(x+2),∵y=y1+y2∴y=kx+m(x+2),把x=2,y=4和x=-1,y=7代入得:2k+4m=4−k+m=7解得:k=-4,m=3,∴y=-4x+3(x+2)即y与
由题意,不妨设:y1=k*根号x,y2=m/x²那么:y=y1+y2=k*根号x+m/x²已知当x=1时,y=-12;当x=4时,y=7,则有:{k+m=-12(1){2k+m/1
设y1=k1*√x,y2=k2*(1/x^2);x=1时,y=y1+y2=k1+k2=11x=4时,y=y1+y2=2*k1+k2/16=6.5解得k1=3,k2=8y=3*√x+8/x^2x=9时,
y1与x成正比例y1=kxy2与x-1成正比例y2=m(x-1)所以y=kx+m(x-1)当x=-1时,y=2;当x=2时,y=5,所以2=-k-2m5=2k+m所以k=4,m=-3所以y=4x-3(
设y1=axy2=b/x²Y=Y1+Y2=ax+b/x²当x=22a+b/4=19当x=33a+b/9=19解得a=5,b=36所以y=5x+36/x²
设K为y1比列系数,u为y2比列系数y1=kxy2=u1/xy=kx+u1/x把X=1时,Y=3;当X=-5时,Y=2带代入方程,就行联立求出K,U听简单的,2元一次方程,解得U=7.5K=-4.5所
此题怎么没有应聘的?1、解不出来若是y=ax^2+bx还可以5=a+b11=a-ba=8,b=-3y=8x^2-3xx=2时,y=32-6=262、快车车速600/10=60公里/小时慢车车速600/
设y1=kx2,y2=a(x-2),则y=kx2+a(x-2),把x=1,y=5和x=-1,y=11代入得:k−a=5k−3a=11,k=-3,a=2,∴y与x之间的函数表达式是y=-3x2+2(x-
解由当x=2时,y1+y2=-1得2k1+2k2=-1即k1+k2=-1/2.①当x=3时,y1-y2=12得3k1-3k2=12即k1-k2=4.②由(1)与(2)联立解得k1=7/4,k2=-9/