第一题
=15/4-13/6+1/4
=45/12-26/12+3/12
=11/6
第二题
=11/12+22/7+37/12+41/7-0.123
=11/12+37/12+22/7+41/7-0.123
=4+9-0.123
=13-0.123
=12.877
第一题
=15/4-13/6+1/4
=45/12-26/12+3/12
=11/6
第二题
=11/12+22/7+37/12+41/7-0.123
=11/12+37/12+22/7+41/7-0.123
=4+9-0.123
=13-0.123
=12.877