1,3,4,6
5,5,7,11
3,5,5,9
2,5,5,10
1,3,4,6:13×4×6
5,5,7,11:5×(7-11÷5)
3,5,5,9:(9-5÷5)×3
2,5,5,10:5×(5-2÷10)