A 2/3 + 2/15 + 2/35 + 2/63
B (1/15 + 1/35 + 1/63) x X =1
A=12/15 + 28/315
A=8/9
B. 1/9 x X = 1 X= 1: 1/9X= 9Tìm X : a) (1/15 + 1/35 + 1/63) x X =1
b) X - (31/5 + 31/15 + 31/35 + 31/63 + 31/99 + 31/143) =9/13
Các bạn giải thật chi tiết cho mình nhé!!
(1/15+1/35+1/63) *x =1
[1/15 + 1/35 + 1/63] * x = 1
\(\left[\frac{1}{15}+\frac{1}{35}+\frac{1}{36}\right]\cdot x=1\)
\(\frac{31}{252}\cdot x=1\)
\(x=1:\frac{31}{252}\)
\(x=\frac{252}{31}\)
\(\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}\right)\times x=1\)
\(\Leftrightarrow\frac{1}{9}\times x=1\)
\(\Leftrightarrow x=1\div\frac{1}{9}\)
\(\Leftrightarrow x=9\)
Vậy x=9
_Chúc bạn học tốt_
\(\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}\right)\times x=1\)
\(\left(\frac{1}{3\times5}+\frac{1}{5\times7}+\frac{1}{7\times9}\right)\times x=1\)
\(\frac{1}{2}\times\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}\right)\times x=1\)
\(\frac{1}{2}\times\left(\frac{1}{3}-\frac{1}{9}\right)\times x=1\)
\(\frac{1}{2}\times\frac{2}{9}\times x=1\)
\(\frac{1}{9}\times x=1\)
\(x=1:\frac{1}{9}\)
\(x=9\)
(1/15+1/35 +1/63)*x=1
(1/15+1/35+1/63)*x=1
1/9*x=1
x=1 : 1/9
x=1*9
x=9
mk ko quy đồng đâu cậu tự quy đồng nha
(1/15+1/35+1/63)*x=1
(1/15+1/35+1/63)*x=1
1/9*x=1
x =1:1/9
x =9
\(\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}\right)\times x=1\)
\(\frac{1}{9}\times x=1\)
\(x=1\div\frac{1}{9}\)
\(x=9\)
(1/15+1/35+1/63)×X=1
(1/15+1/35+1/63)×X=1
1/9xX =1
X =1:1/9
X =9
x = 1 : (1/15 + 1/35 + 1/63)
x = 9
(1/15+1/35+1/63)*x=1
\(\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}\right)xX=1\)
\(\frac{1}{9}xX=1\)
\(X=1:\frac{1}{9}\)
\(X=9\)
những ai không biết đừng có linh tinh nghe chưa !!!
X = 9 nha
( 1/15 + 1/35 + 1/63 ) * x = 1
1/9 : x = 1
x = 1 : 1/9
x = 9
(1/15+1/35+1/63*X=1