估算: 621×9≈ 8×892≈ 699×6≈ 3×701≈ 999×2≈ 302×4≈ 7×504≈ 598×5≈
减去与5.5的积,再除以,商是多少?
x:=:
x-x=18.7
15.8-(6+÷12.5%)
10-÷×1