请1⼀1x2x3+1⼀2x3x4+1⼀3x4x5+1⼀4x5x6=

2024-12-13 02:46:57
推荐回答(2个)
回答1:

=1/2×(1/1×2-1/2×3+1/2×3-1/3×4+1/3×4-1/4×5+1/4×5-1/5×6)
=1/2×(1/1×2-1/5×6)
=7/30

回答2:

6+6+20/3+30/4=157/6