先说出各题的运算顺序,再计算。3.8×0.9+4.8÷2.26.48÷[(1.4-0.8)×0.9]
()÷20-[(
14.8×6.3-6.3×6.5+8.3×3.718.1+(3-0.299÷0.23)×1
5.09-(0.09+1.23) 9.36-(4.36-3.5)
7.5-2.45+7.5+2.45(-)×21+
2.5×(1.92÷0.3-5.9) 24.5-(7.58+)