Cho A = 13 + 132 + 133 + 134 + 135 + 136. Chứng tỏ rằng A ⋮...
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Cho A = 13 + 132 + 133 + 134 + 135 + 136. Chứng tỏ rằng A ⋮ 2
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Những câu hỏi liên quan
17 tháng 5 2023
ENGLISH ON TAG QUESTION
131. They don't like cats, ____do they____?
132. She loves flowers, ____doesn't she____?
133. You are a student, ___aren't you____?
134. Jane can't swim, _____can she___?
135. They mustn't buy the car, ____must they____?
136. Billy has made a beautiful kite, ____hasn't he____?
137. You won't trust him, ____will you___?
138. Kathy and YoYo will go to the swimming pool tomorrow, ____won't they____?
139. Mrs. White ate a lot of fish yesterday, ____didn't she____?
140. Ken didn't visit his grandfather last week, ___did he____?
141. You don't like fishing, _____do you___?
142. Fiona likes Jacky Chan, ____doesn't she____?
143. She must come to the party, ___mustn't she____?
144. Lucy will buy the dress, ___won't she_____?
145. Mimi and Lily were sad yesterday, ____weren't they____?
146. Kate always sleeps early, ____doesn't she____?
147. He won't be happy, ___will he____?
148. You didn't do homework yesterday, ___did you____?
149. We kept some money under the bed, ____didn't we____?
150. It seldom barks, ___does it_____?
151. Michael and Melody often go home late, ____don't they____?
152. Hugh had a red car, ___didn't he_____?
153. The Mount Rushmore National Memorial Park is in Keystone, ____isn't it___?
154. The rock was a sacred Indian site once, ___wasn't it____?
155. It has been a national memorial since 1925, ____hasn't it___?
156. The monument doesn't show the bust of President Clinton, ____does it___?
157. George Washington was the first President of the United States, ____wasn't he___?
158. Mr. McGuinness is from Ireland, ____isn't he___?
159. The car isn't in the garage, ___is it____?
160. You are John, ___aren't you____?
161. She went to the library yesterday, ___didn't she____?
PT
1
CM
19 tháng 7 2018
Các số không chia hết cho 3 nhưng không chia hết cho 9 là: 132
CM
24 tháng 4 2019
Các số vừa không chia hết cho 3 và vừa không chia hết cho 9 là: 133; 134; 143; 145
A = 13 + 132 + 133 + 134 + 135 + 136
A = (13 + 132) + ( 133 + 134) + (135 + 136)
A = 13 \(\times\) ( 1 + 13) + 133 \(\times\) ( 1 + 13) + 135 \(\times\) ( 1 + 13)
A = 13 \(\times\) 14 + 133 \(\times\) 14 + 135 \(\times\) 14
A = 14 \(\times\) ( 13 + 133 + 135) vì 14 ⋮ 2
⇒ A ⋮ 2 ( đpcm)