8.6*2.7+62*14%+35*0.86
=0.86*27+62*0.14+35*0.86
=0.86*(27+35)+62*0.14
=0.86*62+62*0.14
=62*(0.86+0.14)
=62*1
=62
121*27+121*60+121*16+79*91+12*79
=121*(27+60+16)+79*(91+12)
=121*103+79*103
=103*(121+79)
=103*200
=20600