Step-by-step explanation:
câu trả lời là trong hình ảnh trên
Answer:
1665
Step-by-step explanation:
This is AP, where:
- First term is: 12= 3*4
- Last term is: 99= 3*33
- Common difference is: 3
- Number of terms is: 33- 3= 30 (because the 4th term is included)
The sum of all two - digit natural numbers which are divisible by 3 is 1665
Subtract 6 from both sides
15x= 195
Divide both sides by 15
x=13
Final answer: x=13
Check:
15(13)+6
195+6
201
201=201
For the first 1 X= 11 because all you need to do is add or subtract the numbers visible.
The second would be 2.
Answer:
77
Step-by-step explanation:
a tirangle has 180 degrees so 180-53-50=77
and x value is 77, that is easy.
