Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời:
Phân tích: (18.123+9.436.2−3.3510.6)=18.123+18.436−18.5310(18.123+9.436.2−3.3510.6)=18.123+18.436−18.5310⇔18.(123+436−3510)⇔18.(123+436−3510)( chung số 18 )
⇔18.(−4751)=−85518⇔18.(−4751)=−85518
Tiếp tục phân tích vế sau:
(1+4+7+...+100−410)=[(100−1):3+1].(100+1)2−410(1+4+7+...+100−410)=[(100−1):3+1].(100+1)2−410⇔1717−410=1307⇔1717−410=1307
⇔−85518:1717=−855181717⇔−85518:1717=−855181717
Vậy (18.123 + 9.436.2 + 3.5310.6 ) : ( 1 + 4 + 7 + ....... + 100 - 410 )=−855181717
~Học tốt!~
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
+) \(1+4+7+...+100=\left(1+100\right)+\left(4+97\right)+...+\left(49+52\right)\)(34 cặp)
\(=101.34=3434\)
+) \(3434-410=3024\)
+) \(\left(18.123+9.436.2+3.5310.6\right)=18\left(123+436+5310\right)\)
\(=18.5869=105642\)
Vậy \(A=105642:3024\approx34,93\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(18\cdot123+9\cdot436.2+3\cdot5310\cdot6\right):\left(1+4+7+.....+100\right)-410\)
\(=\left(18\cdot123+18\cdot436+18\cdot5310\right):1717-410\)
\(=18\cdot\left(123+436+5310\right):1717-410\)
\(=18\cdot5869:1717-410\)
\(=61,52-410\)
\(=-348,47\)
đề bài sai hay sao đó bạn
kiểm tra lại đi
Phân tích: \(\left(18.123+9.436.2-3.3510.6\right)=18.123+18.436-18.5310\)\(\Leftrightarrow18.\left(123+436-3510\right)\)( chung số 18 )
\(\Leftrightarrow18.\left(-4751\right)=-85518\)
Tiếp tục phân tích vế sau:
\(\left(1+4+7+...+100-410\right)=\dfrac{\left[\left(100-1\right):3+1\right].\left(100+1\right)}{2}-410\)\(\Leftrightarrow1717-410=1307\)
\(\Leftrightarrow-85518:1717=\dfrac{-85518}{1717}\)
Vậy.............................