求解二元一次方程,x/12+60-x/y=3.5 x/y+60-x/12=4.5
问题描述:
求解二元一次方程,x/12+60-x/y=3.5 x/y+60-x/12=4.5
答
x/12 + (60-x)/y = 3.5 (1)x/y + (60-x)/12 = 4.5 (2)化简:x/12 + 60/y - x/y = 3.5 (3)x/y + 5 - x/12 = 4.5 (4)(3)+(4):60/y+5 = 3.5+4.560/y = 3y=20代入(4)得:x/20+5-x/12=4.50.5 = x(1/12-1/2...