【简答题】计算: 1 8 × 1 6 + 7 8 ÷6 9.6÷0.4÷2.5 (8× 4 9 +8× 5 9 )÷ 4 11 .
【简答题】灵活计算. 7 8 ×0.375+ 3 8 ÷ 8 9 12 7 -( 5 7 + 1 2 ) [1-( 1 4 + 3 8 )]÷ 1 4 1 8 ×58+ 1 8 ×42 5 9 ×6+ 4 9 ÷ 1 6 180÷2.5÷4.
【简答题】计算下列各题: (1)3450-450÷25×18= (2) 4 2 3 ×1 1 8 ÷6 3 10 = (3) 18÷2.5+1 3 5 ×6.5 = (4) ( 2 7 + 3 5 - 5 42 )÷6+4 1 3 = (5) 7 8 × 10 3 -(0.2+ 1 6 - 1 7 )÷ 10 21 = (6) 2×2 1×3 + 4×4 3×5 + 6×6 5×7 + 8×8 7×9 + ...
【单选题】成语“寅吃卯粮”中,当“寅”指时辰时指( )。