1)67200:7=9600(КВ.м)
2.61600:8=7700(КВ.м)
3.9600-7700=1900(КВ.м)
14/49=0.285...
9/15= 0.6
12/15=0.8
14/18=0.777...
8/12=0.666...
12/16=0.75
12/18=0.666...
21/40=0.525
18/27=0.666
20/70=2.857...
8/36=0.222...
30/75=0.4
1.32х =10 3/5 - 4 5/6x-4.15 =2.1
x = 6 3/5 : 1.32 5/6x=2.1+4.15
x = 5 x=6.25: 5/6
x =7 1/2