16x+71=106

16x=35

x=35/16

k mk nha

35/16

1) x={6;7;8;...} hoặc x={0;-1;-2;...}

2) 2^4x-3+74=106

16x-3+74=106

16x=35

x=35/16

thử lại câu 1 mik ko chắc

sai thì chỉ giùm

17.64-4.52-3.12=1008-208-36=764

#Monster

\(2.3^{x+3}=10.3^{12}+8.3^{12}\)

\(\Leftrightarrow2.3^{x+3}=18.3^{12}\)

\(\Leftrightarrow3^{x+3}=9.3^{12}\)

\(\Leftrightarrow3^{x+3}=3^{14}\)

\(\Leftrightarrow x+3=14\Leftrightarrow x=11\)

\(\Leftrightarrow2\cdot3^{x+3}=3^{12}\cdot18\\ \Leftrightarrow2\cdot3^{x+3}=3^{14}\cdot2\\ \Leftrightarrow x+3=14\Leftrightarrow x=11\)

2.3x+3=10.312+8.3122.3x+3=10.312+8.312

=2.3x+3=18.312⇔2.3x+3=18.312

=3x+3=9.312⇔3x+3=9.312

=3x+3=314⇔3x+3=314

( x - 41 ) . 109 = 74 . 215 - 74 . 106

( x - 41 ) . 109 = 74 . ( 215 - 106 )

( x - 41 ) . 109 = 74 . 109

x - 41 = 74 . 109 : 109

x - 41 = 74

x = 74 + 41

x = 115

Vậy x = 115

=))

\(\left(x-41\right)\times109=74\times215-74\times106\)

\(\left(x-41\right)\times109=74\left(215-106\right)=74.109\)

Chia cả hai vế cho 109 \(\Rightarrow x-41=74\)

\(x=74-41=34\)

(x - 41) x 109 = 74 x 215 - 74 x 106

(x - 41) x 109 = 74 x (215 - 106)

(x - 41) x 109 = 74 x 109

=> x - 41 = 74

=> x   = 74 + 41

=> x   =   115.

Bạn k mik nha !!!

Chọn C

-1/2.3x+3/4=-2.25

-1/2.3x+3/4=9/4

-1/2.3x      =9/4-3/4

-1/2.3x      =3/2

       3x     =3/2:-1/2

       3x     =-3

        x     =-3:3

        x     =-1

vậy   x=-1

\(-\frac{1}{2}.3x+\frac{3}{4}=-2,25\)

\(\Rightarrow\frac{1}{2}.(-3).x+\frac{1}{2}.\frac{3}{2}=\frac{9}{4}\)

\(\Rightarrow\frac{1}{2}.\left(-3x+\frac{3}{2}\right)=\frac{9}{4}\)

\(\Rightarrow-3x+\frac{3}{2}=\frac{9}{4}:\frac{1}{2}\)

\(\Rightarrow-3x+\frac{3}{2}=\frac{9}{2}\)

\(\Rightarrow-3x=3\)

\(\Rightarrow x=-1\)

a: \(\Leftrightarrow\left(2x-5\right)^3=225-4\cdot100=125\)

=>2x-5=5

=>2x=10

hay x=5

b: \(\Leftrightarrow\left(x-2\right)\left(x-5\right)=0\)

hay \(x\in\left\{2;5\right\}\)

c: =>x-5-2x-7=-8

=>-x-12=-8

=>x+12=8

hay x=-4

\(\left(2x-5\right)^3=15^2-4.5^2\)

\(\Leftrightarrow\left(2x-5\right)^3=125\)

\(\Leftrightarrow2x-5=5\)

\(\Leftrightarrow x=5\)

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\(\left(x-2\right)\left(15-3x\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=0\\15-3x=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\)

____________________________________________

\(\left(x-5\right)-\left(2x+7\right)=-8\)

\(\Leftrightarrow x-5-2x-7=-8\)

\(\Leftrightarrow-x=4\)

\(\Leftrightarrow x=-4\)