用竖式计算.
8.1×1.3-8×1.3+1.9×1.3+11.9÷1.36[(7.6-5.2)÷0.4+2.54]×32
2.9×1.4+2×1.6 (2.44-1.8)÷0.4×20
18.5-(5.2+3.3)÷1.7 (2.5×8)÷(0.1-0.09)
(2.7+12.5)÷0.5-5.6 1.25×16-0.6×25+65
7.28+(1.72-0.5) 2.25×4.8+7.75×4.8