(1/3+11/12-3/4)÷1/24
=(1/3+11/12-3/4)*24
=1/3 *24+11/12 *24-3/4 *24
=8+22-18
=30-18
=12
=(1/3+11/12-3/4)*24
=1/3 *24+11/12 *24-3/4 *24
=8+22-18
=30-18
=12
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