mathes(唔識做,help!)求求各高人help me!!!

用+ - */( ) 不分排列 計出黎,help me!!我d 同學都唔識呀!如果可以的就help me
thank you very much!!!!!!!

1) 0.1,0.3,2.6,7.2 =3
2) 0.1,0.5,2,4.2 =0
3) 1.1,1.1,6,7.2 =0.2
4) 3.2,5,10,16 =0.1
5) 0.5,1,2,2.5 =2
6) 1.5,2,3,10 =7
7) 0.3,4,7,10 =0.4
8) 0.4,5,10,75 =28
9) 2.3,2,1.8,1.5 =6.7
10) 0.8,4.2,10,10 =9.5
please help me!! thank you very much!