1⼀4÷(1⼀39)+3⼀4×27用用简算方法?

2025-04-13 01:32:33
推荐回答(1个)
回答(1):

原式=(1/4) × 39 + [(1/4) × 3] × 27
=(1/4) × 39 + (1/4)×3×27
=1/4 × (39 + 81)
=1/4 × 120
=30