bn nhân tích chéo rồi tự tính nhé

  (30 : 7,5 + 0,5 x 3 - 1,5) x (4,5 - 9 : 2)

= (30 : 7,5 + 0,5 x 3 - 1,5) x (4,5 - 4,5)

= (30 : 7,5 + 0,5 x 3 - 1,5) x 0

= 0

câu trên chuẩn

(4,5*16-1,7):4.5*15+2.8

=\(\frac{4,5\cdot16-1.7}{4,5\cdot15+2,8}\)                       

=\(\frac{4,5\cdot\left(15+1\right)-1.7}{4,5\cdot15+2,8}\) 

=\(\frac{4,5\cdot15+4,5-1,7}{4,5\cdot15+2.8}\) 

=\(\frac{4,5\cdot15+2,8}{4,5\cdot15+2,8}\) 

=1

\(\sqrt{\frac{98}{8}}\)=7/2=3,5

quên, bấm nút tl, làm tip

\(\sqrt{x}\)= (2,8 - 3,5)/1,5 = -0,7/1,5

vô nghĩa vì căn bậc 2 k âm, pt vn

x × 1,4 = 2,8 × 1,5

x × 1,4 = 4,2

x = 4,2 : 1,4

x = 3

Đáp số: 19,5

a) x = 40

b) x = 18

c) x = KHÔNG NHỚ NỮA

\(\left(\frac{1}{4}x-1,5\right)+\left(\frac{5}{6}-3\right)-\left(\frac{5}{8}x-0,5\right)=45\)

\(\frac{1}{4}x-1,5-\frac{13}{6}-\frac{5}{8}x+0,5=45\)

\(-\frac{3}{8}x-\frac{19}{6}=45\)

\(-\frac{3}{8}x=\frac{289}{6}\)

       \(\Rightarrow x=-\frac{1156}{9}\)

cảm ơn bạn anh nha mà cho em hỏi tại sao x lại ghép đc với nhau z?

tìm x , biết :

a . 1,5 . x + 2,5 = 1

\(1,5.x=-1,5\)

\(x=\dfrac{-1,5}{1,5}\)

\(x=-1\)

b . ( 0,5 . x - 1,3 ) : 0,5 = -1,7

\(0,5.x-1,3=-0,85\)

\(0,5x=-2,15\)

\(x=\dfrac{-2,15}{0,5}\)

\(x=-4,3\)

c . 1,75 .x - 1,5 . x = 0,84

\(x\left(1,75-1,5\right)=0,84\)

\(x.0,25=0,84\)

\(x=3,36\)

d . x + 75% . x + 125% = 1

\(x+\dfrac{75}{100}.x+\dfrac{125}{100}=1\)

\(x+\dfrac{3}{4}.x+\dfrac{5}{4}=1\)

\(x+\dfrac{3}{4}.x=-\dfrac{1}{4}\)

\(x.\left(1+\dfrac{3}{4}\right)=-\dfrac{1}{4}\)

\(x.1,75=-\dfrac{1}{4}\)

\(x=-\dfrac{1}{7}\)

e . x - 25% .x + 75% = 1

\(x-\dfrac{25}{100}.x+\dfrac{75}{100}=1\)

\(x-\dfrac{1}{4}.x+\dfrac{3}{4}=1\)

\(x-\dfrac{1}{4}.x=\dfrac{1}{4}\)

\(x.\left(1-\dfrac{1}{4}\right)=\dfrac{1}{4}\)

\(x.\dfrac{3}{4}=\dfrac{1}{4}\)

\(x=\dfrac{1}{3}\)

f . | x - 1,5 | = 2,37

TH1 : \(x-1,5=2,37\)

\(x=2,37+1,5\)

\(x=3,87\)

TH2 : \(x-1,5=-2,37\)

\(x=-2,37+1,5\)

\(x=-0,87\)

a)\(\dfrac{2,5}{7,5}=\dfrac{x}{\dfrac{3}{5}}\)

<=>\(x=\dfrac{2,5.\dfrac{3}{5}}{7,5}\)

<=>\(x=\dfrac{1,5}{7,5}=\dfrac{1}{5}=0,2\)

b)\(\dfrac{2\dfrac{2}{3}}{x}=\dfrac{1\dfrac{17}{9}}{2}\)

<=>\(\dfrac{\dfrac{8}{3}}{x}=\)\(\dfrac{\dfrac{26}{9}}{2}\)

<=>\(\dfrac{\dfrac{8}{3}.2}{\dfrac{26}{9}}=\dfrac{24}{13}\)

c)\(\dfrac{x-1}{1,5}=\dfrac{2,8}{0,5}\)

<=>\(x-1=\dfrac{1,5.2,8}{0,5}\)

<=>\(x-1=\dfrac{42}{5}=8,4\)

d)\(\dfrac{0,6}{x}=\dfrac{x}{2,4}\)

<=>\(x^2=0,6.2,4 \)

<=>\(x^2=\dfrac{36}{25}\)

<=>\(x=\sqrt{\dfrac{36}{25}}=\dfrac{6}{5}=1,2\)