解一道三元一次方程x+y+z=142x/28+y/30+z/35=4.5x/35+y/30+z/28=4.7

Question

解一道三元一次方程
x+y+z=142
x/28+y/30+z/35=4.5
x/35+y/30+z/28=4.7

Answer 1

x=42
y=30
z=70