1 Кг= 1000г
8Кг 5г = 8005г
3200:(с-14)=20-10
3200:(с-14)=10
с-14=3200:10
с-14=320
с=320+14
с=334
3200:(334-14)=20-10
1) 27/63+28/63=55/63
2) 64/72-63/72=1/72
3) 13/15-10/15=3/15=1/5
4) 20/21+9/21=29/21=1(8/21)
5) 34/36-33/36=1/36
6) 21/48+8/48=29/48
7) 8/36+30/36=38/36=1(2/36)=1(1/18)
8) 20/42+27/42=47/42=1(5/42)
9)35/45-12/45=23/45
10)18/28-12/28+15/28=21/28
11) 4/24+6/24-3/24=7/24
1) 30 *60=1800
2)1800:30=60
<span>a/b * m/k=(a*m)/(b*k)
</span><span>6x/k * z/3y=(6x*z)/(k*3y)
</span><span>4m/r * s/8t=(4m*s)/(r*8t)</span>