АА1 <span>┴ MN</span>
<span>BB1 <span>┴ MN</span></span>
<span><span>CC1 <span>┴ MN</span></span></span>
...........................
1)470+430=900
2)900:3=300
3)300-100=x:5
4)x:5=200
5)x=200*5
6)x=1000
12,48:(104x-1,56)-0,6=9,4
12,48:(104x-1,56)=9,4+0,6
12,48:(104x-1,56)=10
104x-1,56=12,48:10
104x-1,56=1,248
104x=1,248+1,56
104x=2,808
x=2,808:104
x=0,027
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