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b) xy,z+yz,x+zx,y=77, 7

c)0,x(y)+0,y(x)=0,(5)

d)0,xy(z)+0,yz(x)+0,zx(y)=
0,(5)

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Răspuns :

Denisaandreea1402id

b)xyz/10+yzx/10+zxy/10=77,7

100×+10y+z+100y+10z+x+100z+10x+y=777

111x+111y+111z=777

111(×+y+z)=777

x+y+z=7

c)(xy-x)/90+(yx-y)/90=5/9

(×y-x+yx-y)/90=5/9

xy-x+yx-y=50

10x+y-x+10y+x-y=50

10×+10y=50

x+y=5

d)(xyz-xy)/900+(yzx-yz)/900+(zxy-zx)=5/9

(xyz-xy+yzx-yz+zxy-zx)/900=5/9

100x+10y+z-10x-y+100y+10z+x-10y-z+100z+10x+y-10z-x=500

100x+100y+100z=500

x+y+z=5

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