x+(y+z+w)/3=92;(1)y+(z+w+x)/3=86;(2)z+(w+x+y)/3=80;(3)w+(x+y+z)/3=90. (4)(1)+(2)+(3)+(4)2(x+y+z+w)=92+86+80+90<===>x+y+z+w=174.x=(3*92-174)/2=51;y=(3*86-17 展开
x+(y+z+w)/3=92;(1)y+(z+w+x)/3=86;(2)z+(w+x+y)/3=80;(3)w+(x+y+z)/3=90. (4)(1)+(2)+(3)+(4)2(x+y+z+w)=92+86+80+90<===>x+y+z+w=174.x=(3*92-174)/2=51;y=(3*86-174)/2=42;z=(3*80-174)/2=33;w=(3*90-174)/2=48. 收起