0.8×1.5x+900=1.5x+900×0.

问题描述:

0.8×1.5x+900=1.5x+900×0.

0.8×1.5x+900=1.5x+900×0.1.2x+900=1.5x+5401.5x-1.2x=900-5400.3x=360x=1200