25+5^2.x=8^2+6^2
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a, 410. 230=220.230=250
b,925.274.813= 350.312.312=374
Tương tự các câu khác....
a, 410.230 = (22)10.230 = 220.230 = 250
b, 925.274.813 = (32)25.(33)4.(34)3 = 350.312.312 = 374
c, 2550.1255 = (52)50.(53)5 = 5100.515 = 5115
d, 643.48.164 = (26)3.(22)8.(24)4 = 218.216.216 = 250
e, 38 : 36 = 32
210 : 83 = 210 : (23)3 = 210 : 29 = 2
127 : 67 = (12 : 6)7 = 27
@Dương Tuyết Mai

7 x 8 = 56 16 : 2 = 8 36 : 6 = 6 49 : 7 = 7
2 x 5 = 10 72 : 8 = 9 9 x 3 = 27 63 : 7 = 9
6 x 4 = 24 25 : 5 = 5 4 x 8 = 32 7 x 5 = 35
7 x 8 = 56
2 x 5 = 10
6 x 4 = 24
16 : 2 = 8
72 : 8 = 9
25 : 5 = 5
36 : 6 = 6
9 x 3 = 27
4 x 8 = 32
49 : 7 = 7
63 : 7 = 9
7 x 5 = 35

11/15 + 8/5= Tính phân số
6/7 - 5/21=
25/4 x 16/100
7 x 2/49 =
4/3 : 2/9
5/8 : 25 =

\(\dfrac{7}{8}\) \(\times\) \(\dfrac{1}{6}\) + \(\dfrac{7}{8}\) \(\times\) \(\dfrac{2}{6}\) + \(\dfrac{7}{8}\) \(\times\) \(\dfrac{1}{2}\)
= \(\dfrac{7}{8}\) \(\times\) ( \(\dfrac{1}{6}\) + \(\dfrac{2}{6}\) + \(\dfrac{1}{2}\) )
= \(\dfrac{7}{8}\) \(\times\) ( \(\dfrac{3}{6}\) + \(\dfrac{1}{2}\))
= \(\dfrac{7}{8}\) \(\times\) ( \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\))
= \(\dfrac{7}{8}\) \(\times\) 1
= \(\dfrac{7}{8}\)
25 \(\times\) 5 \(\times\) 4 \(\times\)2 - 176
= (25 \(\times\) 4 ) \(\times\) ( 5 \(\times\) 2) - 176
= 100 \(\times\) 10 - 176
= 1000 - 176
= 824
\(\dfrac{7}{8}\times\dfrac{1}{6}+\dfrac{7}{8}\times\dfrac{2}{6}+\dfrac{7}{8}\times\dfrac{1}{2}\)
\(=\dfrac{7}{8}\times\left(\dfrac{1}{6}+\dfrac{2}{6}+\dfrac{1}{2}\right)\)
\(=\dfrac{7}{8}\times1\)
\(=\dfrac{7}{8}\)
__________________________
\(25\times5\times4\times2-176\)
\(=\left(25\times4\right)\times\left(4\times2\right)-176\)
\(=1000-176\)
\(=824\)
Chúc bạn học tốt

(-75) : (x + 6) = -15
x + 6 = -75 : (-15)
x + 6 = 5
x = 5 - 6
x = -1
B) -25 - 5.(x + 2) = 50
5(x + 2) = -25 - 50
5(x + 2) = -75
x + 2 = -75 : 5
x + 2 = - 15
x = -15 - 2
x = -17
D) 6.(2x - 8) - 8.(3x - 5) = -56
12x - 24 - 24x + 40 = -56
-12x + 16 = -56
-12x = -56 - 16
-12x = -72
x = (-72) : (-12)
x = 6
Lời giải:
a.
$-75:(x+6)=-15$
$x+6=(-75):(-15)=5$
$x=5-6=-1$
b.
$-25-5(x+2)=50$
$5(x+2)=-25-50=-75$
$x+2=-75:5=-15$
$x=-15-2=-17$
d.
$6(2x-8)-8(3x-5)=-56$
$(12x-48)-(24x-40)=-56$
$-12x-8=-56$
$-12x=-56+8=-48$
$x=(-48):(-12)=4$

1 , \(\frac{3}{8}\) - \(\frac{1}{6}\) .x=\(\frac{1}{4}\)
\(\frac{1}{6}\) .x=\(\frac{3}{8}\)- \(\frac{1}{4}\)
\(\frac{1}{6}\) .x=\(\frac{1}{8}\)
x=\(\frac{1}{8}\) : \(\frac{1}{6}\)
x=\(\frac{3}{4}\)
2, x2 + \(\frac{-9}{25}\) =\(\frac{2}{5}\) - \(\frac{8}{5}\)
x2 + \(\frac{-9}{25}\) = \(\frac{-6}{5}\)
x2 =\(\frac{-6}{5}\) - \(\frac{-9}{25}\)
x2 =\(\frac{-39}{25}\)
Vì x2 ko bằng \(\frac{-39}{25}\) nên x thuộc rỗng
\(25+5^2.x=8^2+6^2\)
\(25+25.x=64+36\)
\(25\left(x+1\right)=100\)
\(x+1=100:25\)
\(x+1=4\)
\(\Rightarrow x=4-1=3\)
Vậy \(x=3.\)
\(25+5^2\cdot x=8^2+6^2\)
\(25+25\cdot x=64+36\)
\(25+25\cdot x=100\)
\(25\cdot x=100-25\)
\(25\cdot x=75\)
\(x=75:25\)
\(x=3\)
Vậy \(x=3\)