(44x52x60):(11x13x15)
ting mot cach hop li:
(44x52x60) : ( 11x13x15)
tinh nhanh :
(44x52x60) : (11x15x13)
123x456456-123123x456
a vab voi a>b va thao man 3.(a+b)=5.a(a-b). Tim thuong cua a va b
Tính nhanh:
(42x52x60):(11x13x15)=
tinh nhanh :
(44x52x60) : (11x15x13)
123x456456-123123x456
chi co ma ban ko chiu suy nghi chu bài này dau co kho
to chac chan de bai cau khong ghi
dug hoac la ghi linh tinh de co cau
hoi chuan men
Tính nhanh:4/1x3x5+4/3x5x7+4/5x7x9+4/7x9x11+4/9x11x13+4/11x13x15
\(\frac{11x13x15+33x39x45+55x65x75+99x117x135}{13x15x17+39x45x51+65x75x85+117x135x153}\)
cacs số sau là số nguyên tố hay hợp số
7x1-70
3x6x5-5x17
4x5x7x11+11x13x15
gải đầy đủ nha
a. Tìm n, m là các số tự nhiên với m<n<10 sao cho \(\frac{1}{m}\) - \(\frac{1}{n}\) = \(\frac{1}{6}\).
b. So sánh A và B biết: \(A=\frac{11x13x15+33x39x45+55x65x75+99x177x135}{10x13x17+39x45x51+65x75x85+117x135x153}:B=\frac{1111}{1717}\)
( Cảm phiền ghi cách làm luôn ah!)
so sanh a va b biet : A= 11x13x15+33x39x45+55x65x75+99x117x135/ 13x15x17+39x45x51+65x75x85+117x135x153 B=1111/1718
Minh can cac ban giai ho minh bai nay ! Cam on
\(A=\frac{11\times13\times15+3\times\left(11\times13\times15\right)+5\times\left(11\times13\times15\right)+9\times\left(11\times13\times15\right)}{13\times15\times17+3\times\left(13\times15\times17\right)+5\times\left(13\times15\times17\right)+9\times\left(13\times15\times17\right)}\)
\(A=\frac{\left(11\times13\times15\right)\times\left(1+3+5+9\right)}{\left(13\times15\times17\right)\times\left(1+3+5+9\right)}\)
\(A=\frac{11}{17}>\frac{1111}{1718}\)
\(A=\frac{11\cdot13\cdot15+33\cdot39\cdot45+55\cdot65\cdot75+99\cdot117\cdot135}{13\cdot15\cdot17+39\cdot45\cdot51+65\cdot75\cdot85+117\cdot135\cdot153}\)
\(A=\frac{11\cdot13\cdot15\cdot\left(1+3+5+9\right)}{13\cdot15\cdot17\cdot\left(1+3+5+9\right)}\)
\(A=\frac{11\cdot13\cdot15}{13\cdot15\cdot17}\)
\(A=\frac{11}{17}>\frac{1111}{1718}=B.\)