已知三分之x=四分之y=六分之z≠0,求
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两遍同时乘-6,X=-2Y.
x=-32y=54
二分之(x+y)+三分之(x-y)=13两边同时乘以6得:3(x+y)+2(x-y)=78=>y=78-5x.三分之x+y-四分之x-y=3两边同时乘以12得4(x+y)3(x-y)=18得y=18-
三分之X=0.5+四分之X两边乘以124X=6+3X4X-3X=6X=6
四分之一:x=3-四分之三1/4:x=9/41/4=9x/4x=1/9(五分之二+二分之一):x=三分之五(4/10+5/10)=5x/39/10=5x/3x=27/502x:3=六分之五:八分之五2
设x/2=y/3=z/4=k∴x=2k,y=3k,z=4k∵2x-3y+4z=22∴4k-9k+16k=22∴k=2∴x=4,y=6,z=8∴x+y-z=4+6-8=2
x/2-(y-2)/6=(x+y)/3+1整理得:x-3y=4……①(x-6)/10+y=x/2+21/5整理得:2x-5y=-24……②①×2得,2x-6y=8……③②-③得,y=-32把y=-32
求3y-z分之x=2y-3z的值?这个等号应该是加号吧?如果是加号的话,答案应该是负4/5!
1.x/2=y/3=z/41)x+y+z=12)1)式变形,得y=3x/2z=2x代入2),dex+3x/2+2x=1x=2/9y=1/3z=4/92.两个非负数互为相反数,那么这两个数都为02x+y
已知二分之x=三分之y=四分之z∴y=3x/2;z=2x;3x-2y+z分之2x+y-z=(2x+y-z)/(3x-2y+z)=(2x+3x/2-2x)/(3x-3x+2x)=3x/2/2x=3/4
x/2=y/3则3x=2yy/3=z/4则z=4y/3所以2y-4y+20y/3=14y=3所以z=4x=2
x/3-x/6=2.4两边都乘以62x-x=14.4x=14.4
(x+y)/2-(x-y)/3=5/6①(x+y)/6-(x-y)/3=1/2②①②等号两边分别同时乘以6去分母得:3(x+y)-2(x-y)=5(x+y)-2(x-y)=3令(x+y)=a,(x-y
设x/2=y/3=z/4=k则x=2k,y=3k,z=4k(x²+y²+z²)/(xy+yz+zx)=(4k²+9k²+16k²)/(6k&
三分之X=四分之Y=五分之Zx:y:z=3:4:5设x=3ay=4az=5a(x+y)/(x-2y+3z)=(3a+4a)/(3a-8a+15a)=7a/10a=7/10
cos(x-π/6)=-√3/3cosx+cos(x-π/3)=cos(x-π/6+π/6)+cos(x-π/6-π/6)=cos(x-π/6)cosπ/6-sin(x-π/6)sinπ/6+cos(
5/6y+1=9/8y+1-1/3-y5/6y+1=1/8y+2/35/6y-1/8y=2/3-117/24y=-1/3y=-8/17
三分之X-Y+四分之X+Y=-2(1)六分之X-Y-八分之X+Y=3(2)(1)*1/2得六分之X-Y+八分之X+Y=-1(3)(2)+(3)得三分之X-Y=2,X-Y=6设Y=X-6(4)代入(1)
22/6-X=4/311/3-4/3=XX=7/3你这个题写的有歧义啊,你看是上边的还是下边的.(22-X)/6=4/33(22-X)=6x466-3X=243X=42X=14
(1)用x/2+y/3=13/2与x/3-y/4=3/2联立x/2+y/3=13/2方程两边乘6得3x+2y=39x/3-y/4=3/2方程两边乘12得4x-3y=18可求出x=9,y=6(2)用y/