Question

[Cù Thị Châu Giang]

a) x + 15 = 89
b) 93 – x = 12.5
c) 2x – 12 = 57
d) 36 : (x + 1) = 4
e) 112 – 45 + 5x = 87
f) 6^2+ 64 : (x – 1) = 52

g) (55 – x).(2x – 44) = 0
h) x^2+ 4 = 13
i) 2.(x +1)^3=16

g)150 – 5(x – 2)^2 = 25

k) (x – 2).y = 3
l) (2 – x).(y – 4) = 8

Answer 1

[༺༒༻²ᵏ⁸]

\(e,112-45+5x=87\)

\(67+5x=87\)

\(5x=20\)

\(x=4\)

\(f,6^2+64:\left(x-1\right)=52\)

\(36+64:\left(x+1\right)=52\)

\(64:\left(x+1\right)=16\)

\(x+1=4\)

\(x=3\)

Answer 2

[༺༒༻²ᵏ⁸]

\(g,\left(55-x\right)\left(2x-44\right)=0\)

\(\Rightarrow\hept{\begin{cases}55-x=0\\2x-44=0\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}x=55\\x=22\end{cases}}\)

Vậy ....

\(h,x^2+4=13\)

\(x^2=9\)

\(x^2=\pm3^2\)

\(\Rightarrow x=\pm3\)