口算下面各题.0.68﹣0.48= 2.7+4.3= 5.14+1.86= 2.5﹣1.4=3.3﹣0.5= 1.2﹣0.7= 5.2﹣4= 0.6+0.9=
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