$5=3x-2$
⇔$3x=5+2$
⇔$3x=7$
⇔$x=$ $\frac{7}{3}$
Vậy $S=$ ${\frac{7}{3}}$
$\frac{3}{7}=$ $\frac{5}{x}$
⇔$3x=5.7$
⇔$3x=35$
⇔$x=$ $\frac{35}{3}$
Vậy $S=$ ${\frac{35}{3}}$
$2,5=$ $\frac{x}{6}$
⇔ $\frac{5}{2}=$ $\frac{x}{6}$
⇔ $2x=30$
⇔ $x=15$
Vậy $S=$ ${15}$
$175 = 27-100-27-150:x$
⇔$175=-100-$ $\frac{150}{x}$
⇔$275=$ $-\frac{150}{x}$
⇔$275x=-150$
⇔$x=$ $-\frac{6}{11}$
Vậy $S=$ ${-\frac{6}{11}}$
$29 = 12-$ $\frac{3}{500}.x$
⇔ $-\frac{3}{500}.x=17$
⇔$x=$ $-\frac{8500}{3}$
Vậy $S=$ ${-\frac{8500}{3}}$
$5=3x-8$
⇔$3x=13$
⇔$x=$ $\frac{13}{3}$
Vậy $S=$ $\frac{13}{3}$
$32=1,8x +32 $
⇔$1,8x=0$
⇔$x=0$
Vậy $S={0}$
$150 = 3,14×3^2 . x :360$
⇔$150=9x+\frac{157}{18000}$
⇔$9x=150-\frac{157}{18000}$
⇔$x≈16,67$
Vậy $S={16,57}$
$35 =\frac{1}{3}×3. x$
⇔$3x=\frac{104}{3}$
⇔$x=$ $\frac{104}{9}$
Vậy $S=$b$\frac{104}{9}$
$chucbanhoktot$
$xinhaynhat$
$Sói$
