X-0.55倍= 0.9 4X-3.9 = 4.5解方程

问题描述:

X-0.55倍= 0.9 4X-3.9 = 4.5解方程

X-0.55倍= 0.9 0.45倍= 0.9×2 = 4X-3.9 = 4.5 4X = 8.4×2.1 =