\(5871:\left[928-\left(247-82\cdot5\right)\right]\)

\(=5871:\left[928-\left(247-410\right)\right]\)

\(=5871:\left[928-\left(-163\right)\right]\)

\(=5871:1091\)

\(=\frac{5871}{1091}\)

kết quả 5,381301558

5871 : [ 928 – (247 – 82 x 5)]

= 5871 : [928 – (247 – 410)]

= 5871 : [928 – (-163)]

= 5871 : 1091

= 5871/1901

chúc bạn may mắn trong kì thi

b﴿ 6 chia hết cho x‐1

=> x‐1 ∈ U﴾6﴿={ ‐1;1;‐2;2;‐3;3;‐6;6}

=> x=0;2;‐1;3;‐2;4;‐5;7

b﴿ 14 chia hết cho 2x+3

=> 2x+3 ∈ U﴾14﴿={ ‐1;1;‐2;2;‐7;7;‐14;14}

Vì 2x+3 là số lẻ

=> 2x+3= ‐1;1;‐7;7

=> 2x=‐4;‐2;‐10;4

=> x= ‐2;‐1;‐5;2 

a)x chia hết cho 12

x chia hết cho 25

=> x thuộc BC﴾12 , 25﴿

12 = 2^2.3 ; 25 = 5^2

=> BCNN﴾12,25﴿ = 2^2.3.5^2 = 300

B﴾300﴿ = {0;300;600;....}

Vậy x = 300

mik biết làm bài a thôi 

2)

c﴿5871:﴾928‐﴾247‐82﴿.5﴿

5871:﴾928‐165.5﴿

5871:﴾928‐825﴿

5871:103

57 

tao chịu.

5871 : [ 928 – (247 – 82 x 5)]

= 5871 : [928 – (247 – 410)]

= 5871 : [928 – (-163)]

= 5871 : 1091

= 5871/1901

chúc bạn may mắn trong kì thi

a; 4.52 - 32 : 24

= 208 - \(\dfrac{4}{3}\)

= \(\dfrac{624}{3}\) - \(\dfrac{4}{3}\)

= \(\dfrac{620}{3}\)

c; 777 : 7 + 1331 : 113

= 111 + \(\dfrac{1331}{113}\)

= \(\dfrac{12543}{113}\) + \(\dfrac{1331}{113}\)

= \(\dfrac{13874}{113}\) 

\(4^x=4^3.4^5\Rightarrow x=3+5=8\)

\(2^x=8.128\Rightarrow2^x=2^3.2^7\Rightarrow x=3+7=10\)

\(4^X=4^3.4^5\)

\(4^X\)=\(4^7\)

\(\Rightarrow\)X=7

\(2^X=8.128\)

\(2^X=2^3.2^7\)

\(2^X\)=\(2^{10}\)

\(\Rightarrow\)x=10

chú ý: dấu nhân kí hiệu là .

4^x=4³.4⁵

4^x=4³⁺⁵

4^x=4⁸

<=> x=8

2^x=8.128

2^x=2³.2⁷

2^x=2³⁺⁷

2^x=2¹⁰

<=> x=10

a. \(\Leftrightarrow16x^2+24x+9-4\left(4x^2-9\right)-5+2x=0\)

\(\Leftrightarrow16x^2+24x+9-16x^2+36-5+2x=0\)

\(\Leftrightarrow26x=-40\)

\(\Leftrightarrow x=\frac{-20}{13}\)

Thanks

\(5871:\left[928-\left(247-82.5\right)\right]\)

\(=5871:\left[928-\left(247-410\right)\right]\)

\(=5871:\left[928-\left(-163\right)\right]\)

\(=5871:1091\)\(=\frac{5871}{1091}\)

5871 : [ 928 – (247 – 82 x 5)]

= 5871 : [928 – (247 – 410)]

= 5871 : [928 – (-163)]

= 5871 : 1091

= 5871/1901

chúc bạn may mắn trong kì thi

\(5871:\left[928-\left(247-82.5\right)\right]\)

\(=5871:\left(928+163\right)\)

\(=5871:1091\)

\(=5,381301558\)

Chúc bạn học tốt !

5871 : [ 928 – (247 – 82 x 5)]

= 5871 : [928 – (247 – 410)]

= 5871 : [928 – (-163)]

= 5871 : 1091

= 5871/1901

chúc bạn may mắn trong kì thi

\(a,128-3.\left(x+4\right)=23\\ \Rightarrow3.\left(x+4\right)=105\\ \Rightarrow x+4=35\\ \Rightarrow x=31\\ b,\left[\left(4x+28\right).3+55\right]:5=35\\ \Rightarrow\left(4x+28\right).3+55=175\\ \Rightarrow4x+28.3=120\\ \Rightarrow4x+28=60\\ \Rightarrow4x=32\\ \Rightarrow x=8.\)

c) \(\left(12x-4^3\right).8^3=4.8^4\)

\(12x-64=4.8^4:8^3\)

\(12x-64=32\)

\(12x=32+64\)

\(12x=96\)

\(x=\dfrac{96}{12}\)

\(x=8\)

d) \(720:\left[41-\left(2x-5\right)\right]:5=35\)

\(720:\left(41-2x+5\right):5=35\)

\(720:\left(46-2x\right)=35.5\)

\(720:\left(46-2x\right)=175\)

\(46-2x=720:175\)

\(46-2x=\dfrac{144}{35}\)

\(2x=46-\dfrac{144}{35}\)

\(2x=\dfrac{1466}{35}\)

\(x=\dfrac{1466}{35}:2\)

\(x=\dfrac{733}{35}\)

lm nốt hộ mik 2 ý cuối vs ạ