Ta có \(\frac{11}{4}\)> \(\frac{x}{20}\)> \(\frac{5}{11}\)

=>    \(\frac{605}{220}\)> \(\frac{11x}{220}\)> \(\frac{100}{220}\)

=> 605 > 11x > 100

=>  56 > x > 9

\(\frac{11}{4}>\frac{x}{20}>\frac{5}{11}\)

\(\Leftrightarrow\frac{605}{220}>\frac{11x}{220}>\frac{100}{220}\)

\(\Leftrightarrow\frac{55}{20}>\frac{x}{20}>\frac{9,\left(09\right)}{20}\)

\(\Rightarrow x\in\left\{11;22;33;44\right\}\)

Nhân bỏ ngoặc, chuyển vế đổi dấu ta được x = 5

\(C=5\frac{9}{10}:\frac{3}{2}-\left(2\frac{1}{3}.4\frac{1}{2}-2.2\frac{1}{3}\right):\frac{7}{4}\)

\(=\frac{59}{10}:\frac{3}{2}-\left(\frac{7}{3}.\frac{9}{2}-2.\frac{7}{3}\right):\frac{7}{4}\)

\(=\frac{59}{15}-\left[\frac{7}{3}\left(\frac{9}{2}-2\right)\right]:\frac{7}{4}\)

\(=\frac{59}{15}-\frac{35}{6}:\frac{7}{4}\)

\(=\frac{59}{15}-\frac{10}{3}\)

\(=\frac{9}{15}=\frac{3}{5}\)

\(\cdot62,87+35,14+4,13+8,35+4,86+5,65\)

\(=\left(62,87+4,13\right)+\left(35,14+4,86\right)+\left(8,35+5,65\right)\)

\(=67+40+14\)

\(=121\)

Đặt \(A=\frac{1.2+2.4+3.6+4.8+5.10}{4+6.8+9.12+12.16+15.20}\)

\(\Rightarrow A=\frac{1.\left(1+2\right)+2.\left(1+2\right)+3.\left(1+2\right)+4.\left(1+2\right)+5.\left(1+2\right)}{4+2.\left(3+4\right)+3.\left(3+4\right)+4.\left(3+4\right)+5.\left(3+4\right)}\)

\(\Rightarrow A=\frac{\left(1+2+3+4+5\right).\left(1+2\right)}{4+\left(2+3+4+5\right).\left(3+4\right)}\)

\(\Rightarrow A=\frac{\left(1+5\right).5:2.\left(1+2\right)}{4+\left(2+5\right).4:2.\left(3+4\right)}\)

\(\Rightarrow A=\frac{6.5:2.3}{4+7.4:2.7}=\frac{45}{4+98}=\frac{45}{102}=\frac{15}{34}\)

Vậy \(A=\frac{15}{34}\)

Chúc bn học tốt

Ta thấy đẳng thức là dạng \(\left|A\right|=-A\Leftrightarrow A\le0\)

Vậy \(2-x\le0\Leftrightarrow x\ge2\)

Vậy giá trị nguyên nhỏ nhất để đẳng thức thỏa mãn là x = 2.

Chúc em học tập tốt :)

\(8x-48+4x-12-14=-x+4\)

\(\Leftrightarrow12x-75=-x+4\Leftrightarrow13x=79\Leftrightarrow x=\dfrac{79}{13}\)

\(-7\left(8-x\right)-6\left(x+9\right)=20-x\Leftrightarrow-56+7x-6x-54=20-x\)

\(\Leftrightarrow2x=130\Leftrightarrow x=65\)

\(9x-63-80+60x=-7x+15\Leftrightarrow76x=158\Leftrightarrow x=\dfrac{79}{38}\)

\(-96-16x-60+30x=-40x-16\Leftrightarrow54x=140\Leftrightarrow x=\dfrac{70}{27}\)

\(17x-102-14x-28=4x-24-2x+4\Leftrightarrow x=110\)

( 2003 - 123 x 8 : 4 ) x ( 36 : 6 - 6 ) 

= ( 2003 - 123 x 8 : 4 ) x ( 6 - 6 )

=  ( 2003 - 123 x 8 : 4 ) x 0

= 0 

Chúc bạn học tốt !

\(\text{( 2003 - 123 x 8 : 4 ) x ( 36 : 6 - 6 )}\)

=\(\text{( 2003 - 123 x 8 : 4 ) x (6 - 6 )}\)

=\(\text{( 2003 - 123 x 8 : 4 ) x}0\)

\(=0\)

học tốt