(-3/5)×3/5+9/25×(-24) 简便计算

问题描述:

(-3/5)×3/5+9/25×(-24) 简便计算

(-3/5)×3/5+9/25×(-24)
=-9/25+9/25×(-24)
=-9/25×(1+24)
=-9/25×25
=-9