问题 解答题 12+13=4-3=1.25×16=170×14÷17=19×21=0.01-0.001=8+8×9=1-38= 答案 12+13=564-3=11.25×16=20170×14÷17=14019×21=3990.01-0.001=0.0098+8×9=801-38=58故答案为:56,1,20,140,399.0.009,80,58.