解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1)/8=3-(0.8x-5y)/41=-=

问题描述:

解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1)/8=3-(0.8x-5y)/41
=-=

(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 ① (3x+2y-1)/8=3-(0.8x-5y)/41 ②①两边同时乘以 60得 (6x+3y)-(24x-6y)=(12x-12y)+(6x+y)整理的9x-5y=0 ③②两边同时乘以 328 得 41(3x+2y-1)=98...