1.(6/10+1/4+1/15+125/1000=3/5+1/4+1/15+1/8=(3·24+30·1+8·1+15·1)/120=
=(72+30+15+8)/120=125/120=25/24
2. 1/3+0,4+4/15=1/3+4/10+4/15=1/3+2/5+4/15=(5+2·3+1)/15=12/15=4/5
3.(25/24: 4/5)·24=24·(25·5/4·24)=25·5/4=125/4=31.25
1 2/5 :0.14=3.5:(0.1х+0.02)
1)..1.4:0.14=10
2).
3.5:(0.1х+0.02)=10,
3).
(0.1х+0.02)=3.5:10=0.35
4).0.1х=0.35-0.02, 0.1х=0.33 , х= 3,3
3.3:18=33/10:18=33/10·1/18=33/180=11/60
Ответ:11/60