（1）120+290÷58*16
=120+29*10÷(29*2)*16
=120+5*16
=120+80
=200
（2）5/6*11+5/6
=5/6*(11+1)
=5/6*12
=10
（3）（2/3-2/5）*（1/8+1/12）
=2*(1/3-1/5)*1/4*(1/2+1/3)
=1/2*2/15*5/6
=1/18