3.4X-9.8=1.4X-9 Z+2/7=4/9Z-3/7
问题描述:
3.4X-9.8=1.4X-9 Z+2/7=4/9Z-3/7
答
3.4X-9.8=1.4X-9
3.4X-1.4X= -9+9.8
2X=0.8
X=0.4
Z+2/7=4/9Z-3/7
4/9Z-Z=3/7+2/7
-5/9Z=5/7
Z= -9/7