-0,3a*3b*14a*9c= -113,4a²bc
k=-113,4 - коэффициент одночлена
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1) (-1 1/6 + 3 1/3)·450 = (-7/6 + 10/3)·450 = -3150/6 + 4500/3 = -525 + 1500 = 975.
2) (-1 5/6 - 2/7)·262,5 = (-11/6 - 2/7)·262,5 =( -77/42 - 12/42 )·262,5 = -89/42 ·262,5 = -23362,5/42 = 556,25.
3) (-2 3/5 - 5/8)·0,4 = (-13/5 - 5/8)·0,4 = (-104/40 -25/40)·0,4 = -129/40·0,4 = -51,6/40 = -1,29.
4) (-5 2/3 - 1 5/7)·10,5 = (-17/3 -12/7)·10,5 = (-119/21 - 36/21)·10,5 = -155/21·10,5 = -1627,5/21 = -77,5.
<span>2k+5t больше 100 ........</span>