∠C=180°-60°-45°=75°
∵c/sinC=a/sinA
∴a=csinA/sinC=20×(根号3/2)÷[(根号6+根号2)/2]=30根号2-10根号6;
∵c/sinC=b/sinB
∴b=csinB/sinC=20×(根号2/2)÷[(根号6+根号2)/2]=20根号3-20;
∠C=180°-60°-45°=75°
∵c/sinC=a/sinA
∴a=csinA/sinC=20×(根号3/2)÷[(根号6+根号2)/2]=30根号2-10根号6;
∵c/sinC=b/sinB
∴b=csinB/sinC=20×(根号2/2)÷[(根号6+根号2)/2]=20根号3-20;