题目内容：

2.61*39.5+0.318*261+2.87*26.1 简便计算

优质解答

2.61*39.5+0.318*261+2.87*26.1
=2.61*39.5+2.61*31.8+2.61*28.7
=2.61(39.5+31.8+28.7)
=2.61*100
=261