有理数乘法简便计算（1道）
问题描述：
有理数乘法简便计算（1道）
(-5.25)*(-4.73)-4.73*(-19.75)-25*(-5.27)=?
简便的,THANK YOU!
答
(-5.25)*(-4.73)-4.73*(-19.75)-25*(-5.27)
=5.25*4.73+4.73*19.75+25*5.27
=4.73*(5.25+19.75)+25*5.27
=4.73*25+25*5.27
=25*(4.73+5.27)
=25*10
=250