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