7t-3s+1=0,4t-2s+17=0解方程
问题描述:
7t-3s+1=0,4t-2s+17=0解方程
答
7t-3s+1=04t-2s+17=07t-3s=-1(1)4t-2s=-17(2)(1)*2 14t-6s=-2(3)(2)*3 12t-6s=-51(4)(3)-(4) 2t=49t=49/2把t=49/2代入(2)2s=4t+17s=2t+17/2=49+17/2=115/2t=49/2s=115/2