\(\left(18\cdot123+9\cdot436.2+3\cdot5310\cdot6\right):\left(1+4+7+.....+100\right)-410\)

\(=\left(18\cdot123+18\cdot436+18\cdot5310\right):1717-410\)

\(=18\cdot\left(123+436+5310\right):1717-410\)

\(=18\cdot5869:1717-410\)

\(=61,52-410\)

\(=-348,47\)

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đề bài sai

giúp mk với

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!~

103,17 nha

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 \(A=105642:3024\approx34,93\)

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.............................