1 ,86/17 : 43/34 = 4
2 ,
a x 3/8 = 31/3 - 4
<=>ax3/8=19/3
<=>a=152/9
Vậy x=152/9
a : 5 = 8/7 +2
<=>a:5=22/7
<=>a=110/7
Vậy a=110/7
1) 86/17 :43/34=86/17 x34/43=4
2) a x 3/8 =31/3 -4 a : 5 = 8/7 + 2
a x 3/8=19/3 a : 5 =22/7
a=19/3 : 3/8 a = 22/7 x 5
a=19/3 x8/3 a = 110/7
a= 152/9
1.
\(\frac{86}{17}:\frac{43}{34}=\frac{86}{17}\times\frac{34}{43}=4\)
2.
\(a\times\frac{3}{8}=\frac{31}{3}-4\)
\(a\times\frac{3}{8}=\frac{19}{3}\)
\(a=\frac{19}{3}\times\frac{3}{8}\)
\(a=\frac{152}{9}\)
\(a:5=\frac{8}{7}+2\)
\(a:5=\frac{22}{7}\)
\(a=\frac{22}{7}\times5\)
\(a=\frac{110}{7}\)
1,\(\frac{86}{17}:\frac{43}{34}=\frac{86}{17}.\frac{34}{43}=\frac{86.34}{47.43}=\frac{2.2}{1.1}=2\)
2,a,\(a.\frac{3}{8}=\frac{31}{3}-4\)
\(=>\frac{3a}{8}=\frac{31}{3}-\frac{12}{3}=\frac{19}{3}\)
\(=>9a=19.8=152\)
\(=>a=\frac{152}{9}\)
b,\(a:5=\frac{8}{7}+2\)
\(=>\frac{a}{5}=\frac{8}{7}+\frac{14}{7}=\frac{22}{7}\)
\(=>7a=22.5=110\)
\(=>a=\frac{110}{7}\)
