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857. Գտե՛ք 2ab տառային արտահայտության թվային արժեքը, եթե՝

ա) a = -1-1/5 = -6/5
-6\5 x 2 = -6\5 x 2\1 = -12\5
B=2 — 2\3 = 8\3
8\3 x 2 = 8\3 x 2\1 = 16\3

բ) a = 7/15
7/15 ⋅ 2 = 7/15 ⋅ 2/1 = 14/15
b = -5/14
-5/14 ⋅ 2 = -5/14 ⋅ 2/1 = -5/7 ⋅ 1/1 = 5/7

գ) a = -4/5
-4/5 ⋅ 2 = -4/5 ⋅ 2/1 = -8/5
b = -1-2/3 = -5/3
-5/3 ⋅ 2 = -5/3 ⋅ 2/1 = -10/3

դ) a = 4-1/2 = 9/2
9\2 x 2=9\2 x 2\1 = — 5\7 x 1\1 = 9\1 = 9
b = -7/9
-7\9 x 2 = -7\9 x 2\1 =14\9