1/2+1/4.(-7/2)-5/4.(-1/8)
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1/2+1/4×(-7/2)-5/4×(-1/8)
1/2- 7/8+5/32
16/32- 28/32+ 5/32
21/32- 28/32
-7/32
1/2- 7/8+5/32
16/32- 28/32+ 5/32
21/32- 28/32
-7/32
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