3/8×(7/8+1/6)÷3/4 9/10×(5/6-2/5)÷13/25
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3/8×(7/8+1/6)÷3/4
=3/8×(7/8+1/6)×4/3
=3/8×4/3×(7/8+1/6)
=1/2×(7/8+1/6)
=7/16+1/12
=21/48+4/48
=25/48
问题二:9/10×(5/6-2/5)÷13/25
=9/10×(5/6-2/5)×25/13
=9/10×25/13×(5/6-2/5)
=45/26×(5/6-2/5)
=225/156-9/13
=225/156-108/156
=3/4
=3/8×(7/8+1/6)×4/3
=3/8×4/3×(7/8+1/6)
=1/2×(7/8+1/6)
=7/16+1/12
=21/48+4/48
=25/48
问题二:9/10×(5/6-2/5)÷13/25
=9/10×(5/6-2/5)×25/13
=9/10×25/13×(5/6-2/5)
=45/26×(5/6-2/5)
=225/156-9/13
=225/156-108/156
=3/4
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