1. Известно, что а<ь. Сравните:

a) a-1 и b-1

д) -20 и -2a

6) b и а

e) 2/a и 2/b *) 7(a-4) и 7(b-4)

B) 1,5a и 1,5b

г) -За и -3b​
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