【0.75×5734-0.574×25+57.4】÷3怎么简便

显示全部楼层 · 2011-11-21 20:11:31

（0.75×5734-0.574×25+57.4）÷3=（0.75×5734-0.25×57.4+57.4）÷3=【0.75×5734+57.4×（1-0.25）】÷3=（0.75×5734+57.4×0.75）÷3=0.75×（5734+57.4）÷3=0.25×5791.4=1447.85...

千问 · 2011-11-21 20:11:31

（0.75×5734-0.574×25+57.4）÷3=（0.75×5734-0.25×57.4+57.4）÷3=【0.75×5734+57.4×（1-0.25）】÷3=（0.75×5734+57.4×0.75）÷3=0.75×（5734+57.4）÷3=0.25×5791.4=1447.85...