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30 : 4 = 7.5
Może pomogłam ;)
I prosze najj .!
30cm:4<boki>=7,5 cm
Każdy bok ma po 7,5 cm
x+1=2 bok
x+2=3 bok
x+3=4 bok
x+x+1+x+2+x+3=30
4x=30-6
4x=24
x=24:4
x=6cm
boki mają:
1 bok=6cm
2 bok=6+1=7cm
3 bok=7+1=8cm
4 bok=8+1=9cm
spr. 6+7+8+9=30