S1=5×4/2=10 (a)
S2=16/2=8 (б)
S3=4×4/2=8 (в)
S4=8×1/2=4 (г)
S5=9×2/2=9 (д)
S6=5×2/2=5(e)
S7=4×2/2=8
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S1=5×4/2=10 (a)
S2=16/2=8 (б)
S3=4×4/2=8 (в)
S4=8×1/2=4 (г)
S5=9×2/2=9 (д)
S6=5×2/2=5(e)
S7=4×2/2=8