1/ 11.107+11.18-25.11
= 1177 + 198 - 275
= 1100
2/ 115-(-85)+53-(-500+53)
= 115 + 85 + 53 + 500 - 53
= 700
3/ (-18)+(-31)+98+|-18|+(-69)
= 18 + (-31) + 98 + (-69)
= -49 - 167
= -118
4/ 17.(15-16)+16(17-20)
= 17.(-1)+16(-3)
= -17 - 48
= -65
5/ 15:(-176)+15.76+100+15
= $\frac{-15}{176}$ +1140 + 100 +15
= 1254.914773
≈ 1254.9