Ответ:
S1=60/2дм*20дм=600дм2
S2=30*50=1500дм2
S1+S2=600+1500=2100 дм2
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Ответ:
S1=60/2дм*20дм=600дм2
S2=30*50=1500дм2
S1+S2=600+1500=2100 дм2