11.解不等式
【RadiationWhy】評論
-1/2(x+6)-(x-3)≧-3(-1/2)x-3-x+3≧-3(-3/2)x≧-3x<=-3X(-2/3) 同乘負數大小於符號要換邊x<=2
-1/2(x+6)-(x-3)≧-3(-1/2)☆-3-☆+3≧-3(-...