设置面积种植蔬菜,西红柿,芹菜,分别为X,Y,Z,列方程?
X / Y = 3/2
Y / Z = 5/7
X + Y + Z = 975
解x = 1.5Y,Z = 1.4y
所以3.9y = 975,Y = 250中,x = 375和z = 350