ὦ=mв-ва*100%/mр-ра
б) ὦ=45/150=0,3*100%=30%
г) ὦ=21/140=0,15*100%=15%
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ὦ=mв-ва*100%/mр-ра
б) ὦ=45/150=0,3*100%=30%
г) ὦ=21/140=0,15*100%=15%