e,\(3\frac{2}{7}x-\frac{1}{8}=2\frac{3}{4}\)
\(=>\frac{23}{7}x-\frac{1}{8}=\frac{11}{4}\)
\(=>\frac{23}{7}x=\frac{11}{4}+\frac{1}{8}=\frac{23}{8}\)
\(=>x=\frac{23}{8}:\frac{23}{7}\)
\(=>x=\frac{7}{8}\)
b) 5 và 4/7 :x=13
39/7 :x =13
x= 39/7 :13
x= 3/7
c)7x-3x=3,2
4x =16/15
x =16/15:4
x =4/15
Trả lời :
b) \(5\frac{4}{7}\div x=13\)
\(x=5\frac{4}{7}\div13\)
\(x=\frac{39}{7}\div13\)
\(x=\frac{3}{7}\)
câu c, d, e lm tương tự : )
~HT~
b, \(5\frac{4}{7}:x=13\)
\(=>\frac{39}{7}:x=13\)
\(=>x=\frac{39}{7}:13\)
\(=>x=\frac{3}{7}\)
c,\(7x-3x=3,2\)
\(=>x\left(7-3\right)=3,2\)
\(=>x.4=3,2\)
\(=>x=3,2:4\)
\(=>x=\frac{4}{5}\)
d,\(2\frac{2}{3}x+8\frac{2}{3}=3\frac{1}{3}\)
\(=>2\frac{2}{3}x=3\frac{1}{3}-8\frac{2}{3}\)
\(=>2\frac{2}{3}x=-5\frac{1}{3}\)
\(=>x=-\frac{16}{3}:\frac{8}{3}=-2\)
2 và 2/3.x +8 và 2/3=3 và 1/3
8/3.x+26/3=10/3
8/3.x=10/3-26/3
8/3.x=-16/3
x=-16/3:8/3
x=-2