\(\Leftrightarrow\dfrac{x+100}{86}+\dfrac{x+100}{85}+\dfrac{x+100}{84}+\dfrac{x+100}{83}=0\)

=>x+100=0

hay x=-100

Có ngu ko đấy, dễ mà???

85.(-24+86)+86.(-85+24)

=-85.24+85.86-86.85+86.24

=-85.24+86.24

=24.(-85+86)

=24.1

=24

Có bạn nào cần đề thi HSG Toán lớp 6 ko? Mình cho nè !

Link: https://dethi.violet.vn/present/show/entry_id/11006794

Chúc bạn học tốt ~ !

11+12+13+14+15+16+17+18+19+...+89+88+87+86+85+84+83+82

=( 11 + 89 )+(12+88)+(13+87)+(14+86)+(15+85)+(16+84)+(17+83)+(18+82)+19

=100+100+100+100+100+100+100+100+19

=800+19

=819

\(37\times46+37\times51+111\)

\(=37\times46+37\times51+37\times3\)

\(=37\times\left(46+51+3\right)\)

\(=37\times100\)

\(=3700\)

------------

\(172\times47+86\times8-34\times4\)

\(=172\times47+172\times4-34\times4\)

\(=172\times\left(47+4\right)-34\times4\)

\(=172\times51-34\times4\)

\(=172\times3\times17-17\times2\times4\)

\(=17\times\left(172\times3-2\times4\right)\)

\(=17\times\left(516-8\right)\)

\(=17\times508\)

\(=8636\)

------------

\(35\times215-35\times200-175\)

\(=35\times215-35\times200-35\times5\)

\(=35\times\left(215-200-5\right)\)

\(=35\times10\)

\(=350\)

------------

\(48\times56+28\times104\)

\(=48\times2\times28+28\times104\)

\(=28\times\left(48\times2+104\right)\)

\(=28\times200\)

\(=5600\)

88 800

261 304

không phải nhé

Len photomax

\(\dfrac{x+14}{86}+\dfrac{x+15}{85}+\dfrac{x+16}{84}+\dfrac{x+17}{83}+\dfrac{x+116}{4}=0\)

\(\Leftrightarrow\left(\dfrac{x+14}{86}+1\right)+\left(\dfrac{x+15}{85}+1\right)+\left(\dfrac{x+16}{84}+1\right)+\left(\dfrac{x+17}{83}+1\right)+\left(\dfrac{x+116}{4}-1\right)=0\)

=>x+100=0

hay x=-100

8. Find the value of 14 x 14 + 2 x 14 x 86 + 86 x 86.

\(=\left(14\times3\right)+\left(86\times3\right)+2\)

\(=42+258+2\)

\(=300+2\)

\(=302\)

14 x 14 + 2 x 14 x 86 + 86 x 86 

= 14 x 14 + 14 x 86 + 14 x 86 + 86 x 86 

= 14 x ( 14 + 86 ) + 86 x ( 14 + 86 ) 

= 14 x 100 + 86 x 100 

= 100 x ( 14 + 86 ) 

= 100 x 100 

= 10000 

86+86+14+14+56+44

=300

chuc ban hok tot

86+86+14+14+56+44=2664

mik nha

= 86+14+86+14+56+44

= 100+100+100

=300

lần sau đừng đặng câu hỏi như này nữa nha!!

a) \(37\times46+37\times51+111\)

\(=37\times46+37\times51+37\times3\)

\(=37\times\left(46+51+3\right)\)

\(=37\times100\)

\(=3700\)

b) \(35\times215-35\times210-175\)

\(=35\times215-35\times210-35\times5\)

\(=35\times\left(215-210-5\right)\)

\(=35\times0\)

\(=0\)

c) \(172\times47+86\times8-34\times4\)

\(=4\times\left(43\times47+86\times2-34\right)\)

\(=4\times\left(2021+172-34\right)\)

\(=4\times2159\)

\(=8636\)

d) \(48\times56+28\times104\)

\(=48\times56+56\times52\)

\(=56\times\left(48+52\right)\)

\(=56\times100\)

\(=5600\)