Ý bạn là sao?= 193 à

1+3+5+7+...+193

= (193+1).97 : 2

= 194.97 .1/2

= 97.(194.1/2)

= 97.97

= 9409

a) \(-7.\left|x-2013\right|+2012^0=\left|+1\right|\)

\(\Leftrightarrow-7.\left|x-2013\right|+1=1\)

\(\Leftrightarrow-7.\left|x-2013\right|=0\)

\(\Leftrightarrow\left|x-2013\right|=0\)

\(\Leftrightarrow x-2013=0\)

\(\Leftrightarrow x=2013\)

Vậy x = 2013

a) -7.|x-2013| + 2012⁰ = |+1|

-7.|x-2013| + 1 = 1

=> -7.|x-2013| = 0

=> | x-2013| = 0

=> x - 2013 = 0

x = 2013

a) \(\left(7x-11\right)^3=2^5.5^2+200\)

\(\Rightarrow\left(7x-11\right)^3=32.25+200\)

\(\Rightarrow\left(7x-11\right)^3=800+200\)

\(\Rightarrow\left(7x-11\right)^3=1000\)

\(\Rightarrow\left(7x-11\right)^3=10^3\)

\(\Rightarrow7x-11=10\)

\(\Rightarrow7x=10+11\)

\(\Rightarrow7x=21\)

\(\Rightarrow x=21:7\)

\(\Rightarrow x=3\)

Vậy x = 3

b) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)

\(\Rightarrow\left(2x-15\right)^5-\left(2x-15\right)^3=0\)

\(\Rightarrow\left(2x-15\right)^3\left[\left(2x-15\right)^2-1\right]=0\)

\(\Rightarrow\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2-1=0\end{cases}}\Rightarrow\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2=1\end{cases}}\)

TH 1 : \(\left(2x-15\right)^3=0\Rightarrow2x-15=0\Rightarrow2x=15\Rightarrow x=\frac{15}{2}\)

TH 2 : \(\left(2x-15\right)^2=1\Rightarrow\orbr{\begin{cases}2x-15=1\\2x-15=-1\end{cases}}\Rightarrow\orbr{\begin{cases}2x=16\\2x=14\end{cases}}\Rightarrow\orbr{\begin{cases}x=8\\x=7\end{cases}}\)

Vậy \(x\in\left\{\frac{15}{2};8;7\right\}\)

_Chúc bạn học tốt_

a) -79.|-45| - 21.|+45|

= -79.45 - 21.45

= 45. (-79-21)

= 45. (-100)

= -4500

b) 29.(23+15) - 23.(29+15)

= 29.23 + 29.15 - 23.29 - 23.15

= (29.23 - 23.29) + (29.15 - 23.15)

= 0 + 15.(29-23)

= 15.6

= 90

\(1-2+3-4+5-\)\(6+....+99-100+101\)

\(=\left(1-2\right)+\left(3-4\right)+\left(5-6\right)+...+\left(99-100\right)+101\)

\(=\left(-1\right)+\left(-1\right)+\left(-1\right)+...+\left(-1\right)+101\)

\(=\left(-1\right).50+101\)

\(=\left(-50\right)+101\)

\(=51\)

1-2+3-4+5-6+...+99-100+101

=(1-2)+(3-4)+(5-6)+...+(99-100)+101

=(-1)+(-1)+(-1)+...+(-1)+101  [ có 50 số (-1) ]

=(-1)×50+101

=(-50)+101

=51

a) 4.5²-3.2³ = 2².5²-3.2³ = 2².(5²-3.2) =2².(25-6) = 4.19 = 76

b) 28.76 + 13.28 + 9.2

= 28. (76 + 13) + 18

= 28. 89 + 18

= 2492 + 18

= 2510

c) 1024: ( 17 .2⁵+15.2⁵)

= 2¹⁰ : [2⁵.(17+15)]

= 2¹⁰: [2⁵. 32]

= 2¹⁰: [2⁵.2⁵)

= 2¹⁰:2¹⁰

= 1

a) 4.5²-3.2³

=2².5²-3.2³

=2².(25-6)

=4.11

=44
 b) 28.76+13.28+9.2

=28.(76+13)+9.2

=28.89+9.2

=2.(1246+9)

=2.1255

=2510
 c) 1024:(17.2⁵+15.2⁵)

=1024:2⁵.(17+15)

=1024:32.32

=1

con hâm

a. -234 + 145 + (-2013) + 155 +(-66) = -2013

b. -95.(-454)-456.95= 95.(454 -456) = -190

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