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1/2+(3/4+4/5)÷7/10
=1/2+(15/20+16/20)x10/7
=1/2+(15+16)/20x10/7
=1/2+31/14
=7/14+31/14
=(7+31)/14
=38/14
=19/7
=2又7分之5
=1/2+(15/20+16/20)x10/7
=1/2+(15+16)/20x10/7
=1/2+31/14
=7/14+31/14
=(7+31)/14
=38/14
=19/7
=2又7分之5
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