2x +15 +25 =50
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(-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.
$6(2x-8)-8(3x-5)=-56$
$(12x-48)-(24x-40)=-56$
$-12x-8=-56$
$-12x=-56+8=-48$
$x=(-48):(-12)=4$
\(A=\left(\frac{x}{25+5x}+\frac{5x+50}{x^2+5x}-\frac{10-2x}{x}\right)\div\frac{3x+15}{7}\)
ĐK : \(\hept{\begin{cases}x\ne0\\x\ne-5\end{cases}}\)
\(=\left(\frac{x}{5\left(x+5\right)}+\frac{5\left(x+10\right)}{x\left(x+5\right)}-\frac{2\left(5-x\right)}{x}\right)\div\frac{3\left(x+5\right)}{7}\)
\(=\left(\frac{x^2}{5x\left(x+5\right)}+\frac{5\cdot5\cdot\left(x+10\right)}{5x\left(x+5\right)}-\frac{2\left(5-x\right)\cdot5\left(x+5\right)}{5x\left(x+5\right)}\right)\div\frac{3\left(x+5\right)}{7}\)
\(=\left(\frac{x^2}{5x\left(x+5\right)}+\frac{25x+250}{5x\left(x+5\right)}-\frac{10\left(25-x^2\right)}{5x\left(x+5\right)}\right)\div\frac{3\left(x+5\right)}{7}\)
\(=\left(\frac{x^2+25x+250-250+10x^2}{5x\left(x+5\right)}\right)\div\frac{3\left(x+5\right)}{7}\)
\(=\frac{11x^2+25x}{5x\left(x+5\right)}\times\frac{7}{3\left(x+5\right)}\)
\(=\frac{77x^2+175x}{15x\left(x+5\right)^2}\)
\(=\frac{77x^2+175x}{15x\left(x^2+10x+25\right)}=\frac{77x^2+175x}{15x^3+150x^2+375x}\)
\(=\frac{77x+175}{15x^2+150x+375}\)
a) 17 x 25 + 25 x 33 +25 x 50 = 25 x (17 + 33 + 50)
= 25 x 100 = 2500
b) 125 x 15 -25 x 15 = 15 x (125 - 25)
= 15 x 100 = 1500
+= (-45+45) + ( -13+-17+20)+48
= 0=0+48=48
+ 100-50/25
=100-2
=98
+= (-3+3)+( -15+20)
=0+-5
=5
+ 2x=73-(-17)
2x=90
x=90/2
x=45
tặng cho mik mấy cái tk nha thanks
45+(-13)+(-17)+(-45)+20+48=38
100-50/25=98
tìm x
2x+(-17)=73
x=45
a) \(x+5=20-\left(12-7\right)\)
\(\Rightarrow x+5=20-5\)
\(\Rightarrow x+5=15\)
\(\Rightarrow x=15-5\)
\(\Rightarrow x=10\)
b) \(15-\left(3+2x\right)=2^2\)
\(\Rightarrow3+2x=15-4\)
\(\Rightarrow3+2x=11\)
\(\Rightarrow2x=11-3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=\dfrac{8}{2}\)
\(\Rightarrow x=4\)
c) \(-11-\left(19-x\right)=50\)
\(\Rightarrow19-x=-11-50\)
\(\Rightarrow19-x=-61\)
\(\Rightarrow x=61+19\)
\(\Rightarrow x=80\)
d) \(159-\left(25-x\right)=43\)
\(\Rightarrow25-x=159-43\)
\(\Rightarrow25-x=116\)
\(\Rightarrow x=25-116\)
\(\Rightarrow x=-91\)
e) \(\left(79-x\right)-43=-\left(17-52\right)\)
\(\Rightarrow\left(79-x\right)-43=52-17\)
\(\Rightarrow79-x-43=35\)
\(\Rightarrow36-x=35\)
\(\Rightarrow x=1\)
f) \(\left(7+x\right)-\left(21-13\right)=32\)
\(\Rightarrow7+x-8=32\)
\(\Rightarrow x-1=32\)
\(\Rightarrow x=32+1\)
\(\Rightarrow x=33\)
g) \(-x+20=-15+8+13\)
\(\Rightarrow-x+20=6\)
\(\Rightarrow x=20-6\)
\(\Rightarrow x=14\)
h) \(-\left(-x+13-142\right)+18=55\)
\(\Rightarrow x-13+142+18=55\)
\(\Rightarrow x+147=55\)
\(\Rightarrow x=55-147\)
\(\Rightarrow x=-92\)
a)(-25)+15+x=50
(-10)+x=50
x=50-(-10)
x=50+10
x=60
b)(-25)+15+x=-35
(-10)+x=-35
x=(-35)-(-10)
x=(-35)+10
x=-25
c)(-25)+15+x=-10
(-10)+x=-10
x=-10-(-10)
x=-10+10
x=0
\(2x+15+25=50\)
\(2x+40=50\)
\(2x=50-40\)
\(2x=10\)
\(x=10:2\)
\(x=5\)
2x + 15 + 25 = 50
= 15 + 25 = 40
= 50 - 40 = 10
= Chỉ có 10 + 40 = 50 thui
=. đề bài sai !