a/ 777³³³ = [(7 . 111)³]¹¹¹ = (7³ . 111³)¹¹¹

333⁷⁷⁷ = [(3 . 111)⁷]¹¹¹ = (3⁷ . 111⁷)¹¹¹

Do: 3⁷ > 7³ ; 111⁷ > 111³   => (3⁷ . 111⁷)¹¹¹ > (7³ . 111³)¹¹¹

=> 333⁷⁷⁷ > 777³³³

\(\dfrac{-1}{2}+\dfrac{3}{5}=\dfrac{1}{10}\)

a)

-19 + [7+ (-9) + 19]

= -19 + 7 - 9 + 19

= [(-19) + 19] + (7 - 9)

= 0 + (-2)

= (-2)

b)

666 - [(-111) - (-333) + 666]

= 666 + 111 - 333 - 666

= (666 - 666) + (111 - 333)

= 0 + (-222)

= -222

Bạn tick cho mình nhé!!!

a) -19 + [7 + (-9) + 19]

= [(-19) + 19] + [(-9) + 7]

= 0 + (-2)

= -2

b) 666 - [(-111) - (-333) + 666]

= 666 - 666 + [(-111) - (-333)]

= 0 - 444

= -444

a)= -19+[-2+19]=-19+17=-2

b)=666-[222+666]=-222

câu a sai đề r bạn , thiếu dấu

   a/ -2 ; b/ -222

24 chia hết cho 2x-1

=> 2x-1 \(\in\) Ư(24)

=> 2x-1 \(\in\) {1,2,3,4,6,8,12,24,-1,-2,-3,-4,-6,-8,-12,-24}

=> 2x \(\in\) { 2; 3;4;5;7;9;13;25;0;-1;-2;-3;-5;-7;-11;-23}

=> x \(\in\) {1;\(\dfrac{3}{2}\); 2; \(\dfrac{5}{2}\); \(\dfrac{7}{2}\);\(\dfrac{9}{2}\); \(\dfrac{13}{2}\); \(\dfrac{25}{2}\); 0;\(\dfrac{-1}{2}\); -1; \(\dfrac{-3}{2}\); \(\dfrac{-5}{2}\); \(\dfrac{-7}{2}\); \(\dfrac{-11}{2}\); \(\dfrac{-23}{2}\)}

Vậy...

=-3720

đồ bấm máy tính ko chấp

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31

+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+4

7+48+49+50-999-888-777-666-555-444-333-222-111= -3720

\(\dfrac{5}{-12}+\dfrac{-1}{20}\)

\(=\dfrac{-5}{12}+\dfrac{-1}{20}\)

\(\dfrac{-25}{60}+\dfrac{-3}{60}\)

\(=\dfrac{-28}{60}=\dfrac{-7}{15}\)

\(\dfrac{-24}{48}+\dfrac{333}{555}\)

\(=\dfrac{-1}{2}+\dfrac{3}{5}\)

\(=\dfrac{-5}{10}+\dfrac{6}{10}\)

\(=\dfrac{1}{10}\)

\(\dfrac{4}{7}+\left(-2\right)\)

\(=\dfrac{4}{7}+\dfrac{-14}{7}\)

\(=\dfrac{-10}{7}\)