360x(1-37.5%-1/3)
=360x(1-3/8-1/3)
=360-360x3/8-360x1/3
=360-135-120
=105吨
答 第二次要用105吨把百分之37.5改成八分之五怎么做？谢谢百分之37.5改成八分之3 呀360x(1-5/8-1/3)=360-360x5/8-360x1/3=360-225-120=15吨