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a 24x-15x=75+33
9x=108
x=108:9=12
b 3-2/5x=2/3
2/5x=3-2/3=1/3
x=1/3:2/5=5/6
Tk & kết bạn với mik nha

\(x+|-15|=12\)
\(x+15=12\)
\(x=12-15\)
\(\Rightarrow x=-3\)
Học Tốt nha !!!

ta có:
15 + (-2x) + 3 = 19
=>18 + (-2x) = 19
=> -2x = 19 - 18
=> -2x = 1
=> x = \(-\frac{1}{2}\)
Do đó không có số nguyên nào thỏa mãn đâu bạn!
-2x+18=19
-2x=1
x=-1/2 \(\notin\)\(Z\)
không có số nguyên nào thỏa mãn

-( x + 84 ) + 213 = -16
=> -x - 84 + 213 = -16
-x = -16 - 213 + 84
-x = -145
=> x = 145
x + ( -35 ) = 18
x = 18 - ( -35 )
x = 18 + 35 = 53
-2x - ( -17 ) = 15
=> -2x + 17 = 15
-2x = 15 - 17
-2x = -2
x = -2 : ( - 2 )
x = 1

a, (3\(\dfrac{1}{5}-2\dfrac{1}{3}+\dfrac{5}{6}\)) - (1,5 - \(\dfrac{2}{3}+\dfrac{1}{6}\))
= \(\dfrac{16}{5}-\dfrac{7}{3}+\dfrac{5}{6}-\dfrac{3}{2}+\dfrac{2}{3}-\dfrac{1}{6}\)
= (\(\dfrac{16}{5}-\dfrac{3}{2}\)) - (\(\dfrac{7}{3}-\dfrac{2}{3}\)) + (\(\dfrac{5}{6}-\dfrac{1}{6}\))
= \(\dfrac{17}{10}-\dfrac{5}{3}+\dfrac{2}{3}\)
= \(\dfrac{17}{10}-1\)
= \(\dfrac{7}{10}\)
@Christina
b, \(\dfrac{\left(3\dfrac{1}{5}.1,4-2,5.\dfrac{7}{108}\right):2\dfrac{7}{18}+4\dfrac{1}{2}.0,1}{70,5-5,28:7\dfrac{1}{2}}\)
= \(\dfrac{\left(\dfrac{16}{5}.\dfrac{7}{5}-\dfrac{5}{2}.\dfrac{7}{108}\right):\dfrac{43}{18}+\dfrac{9}{2}.\dfrac{1}{10}}{\dfrac{141}{2}-\dfrac{132}{25}:\dfrac{15}{2}}\)
= \(\dfrac{\left(\dfrac{112}{25}-\dfrac{35}{216}\right):\dfrac{43}{18}+\dfrac{9}{20}}{\dfrac{141}{2}-\dfrac{88}{125}}\)
= \(\dfrac{\dfrac{112}{25}:\dfrac{43}{18}-\dfrac{25}{216}:\dfrac{43}{18}+\dfrac{9}{20}}{\dfrac{17449}{250}}\)
= \(\dfrac{\dfrac{2016}{1075}-\dfrac{25}{516}+\dfrac{9}{20}}{\dfrac{17449}{250}}\)
= \(\dfrac{\dfrac{2016}{1075}+\dfrac{259}{645}}{\dfrac{17449}{250}}\)
= \(\dfrac{\dfrac{7343}{3225}}{\dfrac{17449}{250}}\)
@Christina

(x-1).(y+2)=5
\(\Rightarrow\)x-1 và y+2 \(\in\)B(5)
\(\Rightarrow\)B(5)\(\in\)\(\left\{\pm1;\pm5\right\}\)
\(\Rightarrow\)Ta có bảng sau:
x-1 | -1 | 1 | -5 | 5 |
---|---|---|---|---|
x | 0 | 2 | -4 | 6 |
y+2 | -5 | 5 | -1 | 1 |
y | -7 | 3 | -3 | -1 |
Vậy:............
nhớ k cho mk!!!
Chúc bạn học tốt
(x-1).(y+2)=5
=>x-1;y+2\(\inƯ\left(5\right);x,y\in Z\)
Khi đó ta có bảng sau
X-1 | -1 | -5 | 1 | 5 |
X | 0 | -4 | 2 | 6 |
Y+2 | -5 | -1 | 5 | 1 |
Y | -7 | -3 | 3 | -1 |
Vậy (x;y) \(\in\){(0;-7),(-4;-3),(2;3),(6;-1)}
\(70,5-5,28:\frac{15}{2}\)
\(=70,5-5,28:7,5\)
\(=70,5-0,704\)
\(=69,796\)
705/10-528/10:15/2
=141/2-264/5:15/2
=141/2-164/25
=3525-328/50
=3197/50