(-1/2)×(-2)=?(-1又1/2)×(-1又1/3)×(-1又1/4)×(-1又1/5)-(-1又1/6)×(-1又1/7)=?

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(-1/2)×(-2)=?(-1又1/2)×(-1又1/3)×(-1又1/4)×(-1又1/5)-(-1又1/6)×(-1又1/7)=?
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(-1/2)×(-2)=?(-1又1/2)×(-1又1/3)×(-1又1/4)×(-1又1/5)-(-1又1/6)×(-1又1/7)=?
(-1/2)×(-2)=?(-1又1/2)×(-1又1/3)×(-1又1/4)×(-1又1/5)-(-1又1/6)×(-1又1/7)=?

(-1/2)×(-2)=?(-1又1/2)×(-1又1/3)×(-1又1/4)×(-1又1/5)-(-1又1/6)×(-1又1/7)=?
(-1/2)×(-2)=1
(-1又1/2)×(-1又1/3)×(-1又1/4)×(-1又1/5)-(?)(-1又1/6)×(-1又1/7)
=(-3/2)×(-4/3)×(-5/4)×(-6/5)-(-7/6)×(-8/7)
= 3/2× 4/3× 5/4 × 6/5 - 7/6 × 8/7
= 6/2 - 8/6
= 3- 4/3
= 1又3分之2

(-1/2)×(-2)=1
(-1又1/2)×(-1又1/3)×(-1又1/4)×(-1又1/5)-(-1又1/6)×(-1又1/7)
=(-3/2)*(-4/3)*(-5/4)*(-6/5)*(-7/6)*(-8/7)
=8/2=4

(-1/2)×(-2)
=1/2×2
=1

原式=(3/2×4/3×5/4×6/5)-(7/6×8/7)
=3-4/3
=1又2/3