Toán Lớp 9: 5 = 3x-2 3/7 = 5/x 2,5 = x/6 175 = 27-100-27-150÷x 29 = 12- 3/500 nhân x 5=3x-8 32=1,8x +32 150 = 3,14×3^2nhân x ÷360 35 = 1/3×3 n

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1. $5=3x-2$

   ⇔$3x=5+2$

   ⇔$3x=7$

   ⇔$x=$ $\frac{7}{3}$ 

   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$\frac{104}{9}$ 

   $chucbanhoktot$

   $xinhaynhat$

   $Sói$

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