juliana0122
21.06.2019 •
Mathematics
2-digit numbers less than 91 which are 1 less than a multiple of 10
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Ответ:
{19, 29, ... , 79, 89}
Step-by-step explanation:
Multiples of 10 are {10, 20, 30, 40, ... , 90}
Numbers which are each 1 less than these multiples of 10 would be:
{9, 19, 29, ... , 79, 89}.
Note that the last number, 89, is less than 91.
We must omit 9 from this set, since 9 is not a 2-digit number. Then our final list is {19, 29, ... , 79, 89}.
Ответ:
12x+26
Step-by-step explanation:
Just expand braket,then add