(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39+0.87)X(0.25+0.39)怎么计算?要用简便方法,包括结果,

(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39+0.87)X(0.25+0.39)=(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39）X(0.25+0.39)+0.87X(0.25+0.39)=(1+0.25+0.39)X(0.25+0.39）+(1+0.25+0.39)X0.87-(1+0.25+0.39）X(0...