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Verified answer

А)   ..........=5а+1,4а+0,4а+12,4+2,6+3,14+2,4=6,8а+20,54

б)   ..........=13,4+6+5,6+7.28+2,3+8,2b+1.7b=34.58+9.9b

anastasyacwetkova 5а+12,4+2,6+3,14+1,4а+0,4а+2,4=(5а+1,4а+0,4а)+(12,4+2,6+3,14+2,4)= 6,8а+20,54
13,4+6+5,6+8,2b+7,28+1,7b+2,3=(8,2b+1,7b)+(13,4+6+5,6+7,28+2,3)= 9,9b+34,58