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L=120cm²
120cm²=15cm×t
120cm²:15cm=t
8cm=t
6. K=s×4
48cm=s×4
48cm:4=s
12cm=s
7. 520cm=2(9cm+t)
520cm:2=9cm+t
260cm=9cm+t
260cm-9cm=t
251cm=t
8. 250cm²=20cm×d2:2
250cm²=10cm×d2
250cm²:10cm=d2
25cm=d2