\(\Rightarrow2\left(x-172\right)=156+111\\ \Rightarrow2\left(x-172\right)=267\\ \Rightarrow x-172=\dfrac{267}{2}\\ \Rightarrow x=\dfrac{267}{2}+172\\ \Rightarrow x=\dfrac{267+2\times172}{2}\\ \Rightarrow\dfrac{267+344}{2}=\dfrac{611}{2}\)

\(2\left(x-172\right)-111=156\)

\(\Rightarrow2\left(x-172\right)=156+111\)

\(\Rightarrow2\left(x-172\right)=267\)

\(\Rightarrow x-172=\dfrac{267}{2}\)

\(\Rightarrow x=\dfrac{267}{2}+172\)

\(\Rightarrow x=\dfrac{267}{2}+\dfrac{172\cdot2}{2}\)

\(\Rightarrow x=\dfrac{267}{2}+\dfrac{344}{2}\)

\(\Rightarrow x=\dfrac{611}{2}\)

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

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

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

\(=37\times100\)

\(=3700\)

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

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

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

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

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

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

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

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

\(=17\times508\)

\(=8636\)

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

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

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

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

\(=35\times10\)

\(=350\)

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

\(48\times56+28\times104\)

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

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

\(=28\times200\)

\(=5600\)

88 800

261 304

không phải nhé

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) \(48\times56+28\times104\)

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

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

\(=56\times100\)

\(=5600\)

=1932

Đúng thì tk 

Đúng 100% nha!

111+151+1515+155=1932

\(111+151+1515+155=1932\)

Tìm X biết: 2 x 172 x X x 252 = 172 x 2 x 252 x 5

X=5

X = 5 nhé

-111/5  x  3= -333/15

do -15 lớn hơn -17 => -111/5 >-333/17

-337/339= -115/339 - 222/339

-115/339 > -155/133   => -337/339 > -155/133

a, x= 155 -51 <=> x=104

b.x=-120 : -24 <=> x=5

c.2(81-x)= 155 -35 

<=> 2(81-x)=120

<=> 81 - x = 60

<=> x= 21

Lời giải:

a.

$155-x=51$

$x=155-51=104$

b. 

$(-24)x=-120$

$x=(-120):(-24)=5$

c.

$35+2(81-x)=155$

$2(81-x)=155-35=120$

$81-x=120:2=60$

$x=81-60=21$

a) 155 - x=51

x= 155 - 51

x= 104

b) (-24) . x= -120

x= -120 : -24

x= 5

c) 35 + 2(81 - x) = 155

2(81 - x)= 155 -35

2(81 - x)= 120

81 - x= 120:2

81-x= 60

x= 81 - 60

x= 21