7/11*8/25+3/11*7/25
=7/25×(8/11+3/11)
=7/25×1
=7/25;
6/11*17-12*3/11
=6/11×17-6/11×6
=6/11×(17-6)
=6/11×11
=6;
手机提问的朋友在客户端右上角评价点【满意】即可.