121乘27加121乘60加121乘16加79乘91加12乘79
=121×(27+60+16)+79×(91+79)
=121×103+79×170
=12463+13430
=25893
6.801减｛0.153加0.801｝
=6.801-0.801-0.153
=6-0.153
=5.847