1/4÷(2/3+1/2)
=1/4÷7/6
=6/28
=3/14
{8/15-(4/5-3/10)}*15/14
=8/15×15/14-4/5×15/14+3/10×15/14
=8/14-6/7+9/14
=(8+9-12)/14
=5/14
1/4÷(2/3+1/2)
=1/4÷7/6
=6/28
=3/14
{8/15-(4/5-3/10)}*15/14
=8/15×15/14-4/5×15/14+3/10×15/14
=8/14-6/7+9/14
=(8+9-12)/14
=5/14