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7/8+括号里的1/4-1/5÷(1/4)
（1）=7/8+(1/4-1/5)÷(1/4)
=7/8+(5/20-4/20)÷(1/4)
=7/8+1/20÷(1/4)
=7/8+1/20x4
=7/8+1/5
=35/40+8/40
=43/40或
=1又3/40
（2）=7/8+(1/4-1/5÷1/4)
=7/8+(1/4-1/5x4)
=7/8+(1/4-4/5)
=7/8+(5/20-16/20)
=7/8-11/20
=35/40-22/40
=13/40
（1）=7/8+(1/4-1/5)÷(1/4)
=7/8+(5/20-4/20)÷(1/4)
=7/8+1/20÷(1/4)
=7/8+1/20x4
=7/8+1/5
=35/40+8/40
=43/40或
=1又3/40
（2）=7/8+(1/4-1/5÷1/4)
=7/8+(1/4-1/5x4)
=7/8+(1/4-4/5)
=7/8+(5/20-16/20)
=7/8-11/20
=35/40-22/40
=13/40
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