解方程组:2x/3+3y/4=1/5 (1) 5x/6-5y/2=2 (2)最好有过程喔!谢谢!

问题描述:

解方程组:2x/3+3y/4=1/5 (1) 5x/6-5y/2=2 (2)
最好有过程喔!谢谢!

2x/3+3y/4=1/5 (1) 5x/6-5y/2=2 (2)
(1)两边同时乘以60,得40x+45y=12(3)
(2)两边同时乘以6,得5x-15y=12(4)
(4)两边同时乘以3,得15x-45y=36(5)
(5)与(3)相加,得55x=48. x=48/55
y=-28/55