упростите вырожение и вычеслите его значение 1) 7(0,5+1)+1,5а-9 при а= -0,8; 2) 3,5(3-4b)-5,7+8b при b=1,3; 3) -6(2/3c+1) +7c+5 при c=7; 4) 0,4(5d-4)-3,4+0,6d при d=5:
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