2/5 + 4/7 : x = 3
4/7 : x = 3 - 2/5
4/7 : x = 13/5
x = 4/7 : 13/5
x = 20/91
Câu 2 :
5/6 - x : 2/3 = 1/2
x : 2/3 = 5/6 - 1/2
x : 2/3 = 1/3
x = 1/3 x 2/3
x = 2/9
lấy 3 trừ 2/5 rồi lấy kết quả chia 4/7 câu 1
câu 2 bạn viết chẳng hiểu gì cả
Câu 1:
2/5+4/7:x=3
4/7:x=3-2/5
4/7:x=13/5
x =13/5*4/7
x = 91/20
Câu 2:
5/6-x:2/3=1/2
5/6-x =1/2*2/3
5/6-x =1/3
x = 5/6-1/3
x =1/2
K mk nha bn>_<
1.
2/5+ 4/7:x =3
4/7:x=3-2/5
4/7:x =13/5
x=4/7:13/5
x=20/91
2.
5/6-x:2/3=1/2
x:2/3=5/6-1/2
x:2/3=1/3
x=1/3*1/2
x=1/6
chúc bạn học tốt
nhớ ks mik
Tìm x :
a, \(\frac{2}{5}+\frac{4}{7}:x=3\)
\(\frac{4}{7}:x=3-\frac{2}{5}\)
\(\frac{4}{7}:x=\frac{13}{5}\)
\(x=\frac{4}{7}:\frac{13}{5}\)
\(x=\frac{20}{91}\)
b, \(\frac{5}{6}-x:\frac{2}{3}=\frac{1}{2}\)
\(x:\frac{2}{3}=\frac{5}{6}-\frac{1}{2}\)
\(x:\frac{2}{3}=\frac{1}{3}\)
\(x=\frac{1}{3}\cdot\frac{2}{3}\)
\(x=\frac{2}{9}\)
Dấu \(\cdot\)là dấu nhân nha bạn !
2/5+4/7:x=3
=>4/7:x=13/5
=>x=4/7:13/5
=>x=20/91 nha
mk ik@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Câu 1:
\(\frac{2}{5}+\frac{4}{7}\div x=3\)
\(\Rightarrow\frac{4}{7}\div x=3-\frac{2}{5}\)
\(\Rightarrow\frac{4}{7}\div x=\frac{13}{5}\)
\(\Rightarrow x=\frac{4}{7}\div\frac{13}{5}\)
\(\Rightarrow x=\frac{20}{91}\)
Vậy \(x=\frac{20}{91}\)
Câu 2:
\(\frac{5}{6}-x\div\frac{2}{3}=\frac{1}{2}\)
\(\Rightarrow x\div\frac{2}{3}=\frac{5}{6}-\frac{1}{2}\)
\(\Rightarrow x\div\frac{2}{3}=\frac{1}{3}\)
\(\Rightarrow x=\frac{1}{3}.\frac{2}{3}\)
\(\Rightarrow x=\frac{2}{9}\)
Vậy \(x=\frac{2}{9}\)
