25+68+68+68+74=25+74+68×3=25+75-1+(70-2)×3=100-1+210-6=310-7=303
25+68+68+68+74= 25 + 70 + 70 + 70 + 75 - 7= (25 + 75 ) + 70 *3 - 7= 310 - 7= 303