解方程组 {13x+17y=53,27x+13y=67

问题描述:

解方程组 {13x+17y=53,27x+13y=67

①+②得40x+30y=120,4x+3y=12 A
②-①得14x-4y=14,7x-2y=7 B
A*2+B*3得8x+21x=45,x=45/29
代入A得y=56/29