解方程0.7X+1/0.4-0.2X-1/.07=1
问题描述:
解方程0.7X+1/0.4-0.2X-1/.07=1
答
0.7X+1/0.4-0.2X-1/.07=1
0.5X+10/4-10/7=1
0.5X=1-10/4+10/7
0.5X=-1/14
X=-1/7