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420: [ 75- (x-10)]=21
75-(x-10)= 420 : 21
75-(x-10)=20
75-x+10=20
75-x =20-10
75-x =10
x =75-10
x =65
420 : (75 - (x - 10)) = 21
75 - (x - 10) = 420 : 21 = 20
x - 10 = 75 - 20 = 55
x = 55 + 10 = 65
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Chăc chết \(\left(3.4.2^{16}\right)^2:\left(11.2^{13}.4^{11}-16\right)^{19}\)
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(47 - 52). 3 + 27
= -5. 3 + 27
= -15 + 27
= 12
-4(39 - 19) + 30(-5 - 15)
= -4. 20 + 30. (-20)
= -80 - 600
= -680
36. (-9) + 9. (-64)
= -9(36 + 64)
= -9. 100
= -900
\(\dfrac{15}{17}+\dfrac{32}{17}=\dfrac{15+32}{17}=\dfrac{47}{17}\)
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Nếu bạn tôn trọng người giải thì hãy ra đề cho lịch sự
hãy dùng dấu (;) đề ra câu hỏi nhé
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-2x-3.(x-17) =34-2.(-x-25)
=> -2x-3.(x-17)+2.(-x-25)=34
=>-2x-3x+51+2.(-x)-50=34
=>-2x-3x-2x+1=34
=>x.(-2-3-2)=33
=>x.(-7)=33
=>x=-33/7
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a)\(x^{15}=x\Rightarrow x\in\left\{0;1\right\}\) d)Là ý b
b)\(\left(2x+1\right)^3=125\\ \left(2x+1\right)^3=5^3\Rightarrow2x+1=5\\ 2x=4\\ x=2\) e)\(\left(x-3\right)^2=25\\ \Rightarrow\left(x-3\right)^2=5^2\\ \Rightarrow\hept{\begin{cases}x-3=5\Rightarrow x=8\\x-3=-5\Rightarrow x=-2\end{cases}}\)
c)\(\left(x-5\right)^4=\left(x-5\right)^6\\ \Rightarrow x-5\in\left\{0;1\right\}\Rightarrow x\in\left\{5;6\right\}\)
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-2x - (x-17) = 34 - (-x+25)
-2x-x+17 = 34+x-25
-3x+17 = x+9
-3x-x = 9-17
-4x = -8
x = -8 : (-4)
x = 2
vậy____
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7(x-3)-5(3-x)=11x-5
<=>7(x-3)+5(x-3)=11x-5
<=>(7+5)(x-3)=11x-5
<=>12(x-3)=11x-5
<=>12x-36=11x-5
<=>12x-11x=-5+36
<=>x=31
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(x-15)-75=19
x-15 =19+75
x-15 =94
x =94+15
x =109
vậy: x=109
nha bn
hc tốt
\(x-15=19:\left(-75\right)\)
\(x-15=-\frac{19}{75}\)
\(x=-\frac{19}{73}+15=\frac{1106}{75}\)
Vậy x=\(\frac{1106}{75}\)