<span>1) 9(7х-6)-18х = 63х - 54 - 18х = 45х - 54
2)7а-6(19-а) = 7a - 114 +6a = 13a - 114
3)0,8(6х-2)+1,6(х-4) = 4,8x - 1,6 + 1,6x - 6,4 = 6,4x - 8
4)2,8(5b-6c)-(7b-8a)×1,2 = 14b - 16,8c - 8,4b + 9,6a = 5,6b - 16,8c + 9,6a
5)-(-4,9-5,8z)-(3,1z-5,6) = 4,9 + 5,8z - 3,1z + 5,6 = 10,5 + 2,7z
6)8/15(2 1/4a - 7 1/2b) - 7/30(4 2/7а - 8 4/7b)</span> = 8/15*9/4a - 8/15* 15/2b - - 7/30*30/7a + 7/30*60/7 = 18/15a - 4b - a + 2 = 1 3/15a - 4b - a + 2 = 3/15a - - 4b +2
1)<span>9(7х-6)-18х=63х-54-18=45х-54
2) </span><span>7а-6(19-а)=7а-114+6а=13а-114
3)</span><span>0,8(6х-2)+1,6(х-4)=4,8х-1,6+1,6х-6,4=6,4х-8
4)</span><span>2,8(5b-6c)-(7b-8a)×1,2=14b-16,8с-8,4b+9,6а=5,6b-16,8с+9,6а
5)</span><span>-(-4,9-5,8z)-(3,1z-5,6)=4,9+5,8z-3,1z+5,6=10,5+2,7z
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