7+8
7.0+8
8+7.0
7.0+8.0
7.0*8.0
5.67*8.79
8.90*9.8777
8.98-0.001
0.89*0.999
1.78-19999.0
56.89+89.999
78.800-98.89
723234234.909+978876.99090909
0.00067-3344.78