Question

\(\frac{6x-3z}{5}=\frac{4y-6x}{7}=\frac{3z-4y}{9}\) và 2x + 3y - 5z = -21

Tìm x; y; z

Answer 1

<img class="irc_mi iAxkr7uWhlxs-pQOPx8XEepE" alt="Kết quả hình ảnh cho tỉ lệ thức" style="margin-top: 64px;" src="http://sgk.vnedu.vn/dataimages/201506/original/images1129577_1_7_baitaptoanlop7tap1_chuong1_bai7_tilethuc_1.jpg" width="304" height="265">

Answer 2

<img style="-webkit-user-select: none" src="http://sgk.vnedu.vn/dataimages/201506/original/images1129577_1_7_baitaptoanlop7tap1_chuong1_bai7_tilethuc_1.jpg">