X/56+Y/70+Z/60=4.5,X/70+Y/56+Z/60=4.7,x+y+z=284解方程,
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X/56+Y/70+Z/60=4.5,X/70+Y/56+Z/60=4.7,x+y+z=284解方程,X/56+Y/70+Z/60=4.5,X/70+Y/56+Z/60=4.7,x+y+z=284解方
X/56+Y/70+Z/60=4.5,X/70+Y/56+Z/60=4.7,x+y+z=284解方程,
X/56+Y/70+Z/60=4.5,X/70+Y/56+Z/60=4.7,x+y+z=284解方程,
X/56+Y/70+Z/60=4.5,X/70+Y/56+Z/60=4.7,x+y+z=284解方程,
x/56+y/70+z/60=4.5…………………………………(1)
x/70+y/56+z/60=4.7…………………………………(2)
x+y+z=284……………………………………………(3)
由(3)得：x=284-y-z…………………………………(4)
代(4)入(1),有：(284-y-z)/56+y/70+z/60=4.5
整理：3y+z=480……………………………………(5)
代(4)入(2),有：(284-y-z)/70+y/56+z/60=4.7
整理：3y+2z=540……………………………………(6)
(6)-(5),得：z=60
代入(5),有：3y+60=480
解得：y=140
将y=140、z=60,代入(4),有：x+140+60=284
解得：x=84
所求方程组的解为：
x=84
y=140
z-60
X/56+Y/70+Z/60=4.5,X/70+Y/56+Z/60=4.7,x+y+z=284解方程,
(x+y-z)(x-y+z)=
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