x1=10 y1=30
x2=20 y2=15
x4=x1*l1+x2*l2/l1+l2
x4=10*20+20*30/20+30=16 (см)
y4=y1*l1+y2*l2/l1+l2
y4=30*20+15*30/20+30=21 (см)
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x1=10 y1=30
x2=20 y2=15
x4=x1*l1+x2*l2/l1+l2
x4=10*20+20*30/20+30=16 (см)
y4=y1*l1+y2*l2/l1+l2
y4=30*20+15*30/20+30=21 (см)