rút gon \(A=\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
CẢM ƠN !
Rút gọn: A = 7.9 + 14.27 + 21.36 / 21.27 + 42.81 + 63.108
Rút gọn tử số và mẫu số, ta được:
1.1+1.1+1.1/3.3+3.3+3.3
=1.3/9.3
Rút gọn 3 trên tử với 3 dưới mẫu
Vậy A=1/9
Tick nhé
1)Rút gọn: A=7.9+14.27-21.36 / 21.27+42.81+63.108
A = \(\frac{7.9+2.7.3.9-3.7.4.9}{3.7.3.9+2.3.7.9.9+7.9.4.3.9}\)
= \(\frac{7.9.\left(1+6-12\right)}{3.7.9.\left(3+18+36\right)}=\frac{-5}{3.57}=\frac{-5}{171}\)
Rút gọn phân số :
A = \(\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
\(A=\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
\(A=\frac{7.9+7.2.9.3+7.3.9.4}{21.27+21.2.27.3+21.3.27.4}\)
\(A=\frac{7.9.\left(1+2.3+3.4\right)}{21.27+\left(1+2.3+3.4\right)}\)
\(A=\frac{7.9}{3.7.3.9}\)
\(A=\frac{1}{3.3}=\frac{1}{9}\)
rút gọn:
\(A=\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
Ta có:A=\(\frac{7.9.\left(1+2.3+3.4\right)}{21.27.\left(1+2.3+3.4\right)}=\frac{7.9}{21.27}=\frac{1}{9}\)
Vậy A=\(\frac{1}{9}\)
rút gọn phân số \(\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
Ta có:
\(\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
\(=\frac{7.9+14.27+21.36}{7.3.9.3+14.3.27.3+21.3.36.3}\)
\(=\frac{7.9+14.27+21.36}{\left(.9+14.27+21.36\right).3.3}\)
\(=\frac{7.9+14.27+21.36}{\left(7.9+14.27+21.36\right).9}\)
\(=\frac{1}{9}\)
Rút gọn phân số: \(\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
ta có:
7.9+14.27+21.36/21.27+42.81+63.108=1/9
Đúng thì like cho mình nhé
Rút Gọn: 7.9+14.27+21.36
21.27+42.81+63.108
So sánh:\(M=\frac{7.9+14.27+21.36}{21.27+42.81+63.108}và M=\frac{37}{333}\)
ta có: \(M=\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\)
\(M=\frac{7.9+7.2.9.3+7.3.9.4}{21.27+21.227.3+21.3.27.4}\)
\(M=\frac{7.9.\left(1+2.3+3.4\right)}{21.27.\left(1+2.3+3.4\right)}\)
\(M=\frac{7.9}{3.7.3.9}\)
\(M=\frac{1}{3^2}\)
\(M=\frac{1}{9}\)
và \(N=\frac{37}{333}=\frac{37}{37.9}=\frac{1}{9}\)
\(N=\frac{1}{9}\)
\(\Rightarrow M=N\left(=\frac{1}{9}\right)\)
M= \(\frac{7.9+14.27+21.36}{21.27+42.81+63.108}\).
M= \(\frac{7.9+14.27+21.36}{7.3.9.3+14.3.27.3+21.3+36.3}\).
M= \(\frac{7.9+14.27+21.36}{7.9.9+14.27.9+21.36.9}\).
M= \(\frac{7.9+14.27+21.36}{9\left(7.9+14.27+21.36\right)}\).
M= \(\frac{1}{9}\).
Ta có: N= \(\frac{37}{333}\)= \(\frac{1}{9}\).
Vì \(\frac{1}{9}\)= \(\frac{1}{9}\) nên M= N.
Vậy M= N.
A=\(\frac{7.9+14.27+21.36+28.45+...+133.180+140.189}{21.27+42.81+63.108+84.135+...+399.540+420.567}\)
A = \(\frac{7.9+7.9\left(2.3\right)+7.9\left(3.4\right)+...+7.9\left(20.21\right)}{21.27+21.27\left(2.3\right)+21.27\left(3.4\right)+...+21.27\left(20.21\right)}\)
A= ... bạn tự nghĩ , mình giúp bước quan trọng nhất rồi .
Sorry nhé , mik chỉ muốn bạn động não .