[(4x-400)/3-100]+(4x-400)/9急求过程和答案
问题描述:
[(4x-400)/3-100]+(4x-400)/9急求过程和答案
答
=[3(4X-400)-900]+4X-400
=12X-1200-900+4X-400
=12X+4X-1200-900-400
=16X-2500