\(\frac{2\cdot4\cdot10+4\cdot6\cdot8+14\cdot16\cdot20}{3\cdot6\cdot15+6\cdot9\cdot12+21\cdot24\cdot30}\)

\(=\frac{8\cdot1\cdot2\cdot5+8\cdot2\cdot3\cdot4+8\cdot7\cdot8\cdot10}{27\cdot1\cdot2\cdot5+27\cdot2\cdot3\cdot4+27\cdot7\cdot8\cdot10}\)

\(=\frac{8\cdot(1\cdot2\cdot5+2\cdot3\cdot4+7\cdot8\cdot10)}{27\cdot(1\cdot2\cdot5+2\cdot3\cdot4+7\cdot8\cdot10)}=\frac{8}{27}\)

\(\frac{2.4.10+4.6.8+14.16.20}{3.6.15+6.9.12+21.24.30}\)

\(=\frac{2\left(1+2+5\right)+2\left(2+3+4\right)+2\left(7+8+10\right)}{3\left(1+2+5\right)+3\left(2+3+4\right)+3\left(7+8+10\right)}\)

\(=\frac{2\left(1+2+5+2+3+4+7+8+10\right)}{3\left(1+2+5+2+3+4+7+8+10\right)}\)

\(=\frac{2}{3}\)

Đáp án bằng \(\frac{8}{27}\)mà Nguyễn Châu Tuấn Kiệt,sao ai cũng k sai mk hết nhỉ??

\(B=\frac{\left(80+192+4480\right)}{\left(270+648+15120\right)}\)

     \(=\frac{4752}{16038}\)

       \(=\frac{8}{27}\)

vì sao??

bạn tính như bt là ra mà ???

Bài này không khó lắm bn hãy nhìn cách làm của mk nhé!

B=\(\dfrac{2.4.10+4.6.8+14.16.18}{3.6.15+6.9.12+21.24.30}\)= \(\dfrac{2\left(1.2.5+2.3.4+7.8.10\right)}{3\left(1.2.5+2.3.4+7.8.10\right)}\)

= \(\dfrac{2}{3}\)

Vậy B=\(\dfrac{2}{3}\)

Nếu bn nghĩ là đúng hãy tick cho mk nha!

Chúc bn học tốt!!!

B= 2.4.10+4.6.8+14.16.20/3.6.15+6.9.12+21.24.30

B=2.[1.2.5 +2.3.4 +7.8.10]/3.[1 .2.5+2.3.4+7.8.10]

B=2/3

B = \(\dfrac{2.4.10+4.6.8+14.16.20}{3.6.15+6.9.12+21.24.30}\)
B = \(\dfrac{2^3.\left(1.2.5+2.3.4+7.8.10\right)}{3^3.\left(1.2.5+2.3.4+7.8.10\right)}\)
B = \(\dfrac{2^3}{3^3}\)
B = \(\dfrac{8}{27}\)

\(=\dfrac{8\cdot10+8\cdot24+8\cdot28\cdot20}{18\cdot15+18\cdot36+18\cdot840}=\dfrac{8\left(10+24+560\right)}{18\left(15+36+840\right)}=\dfrac{4}{9}\cdot\dfrac{2}{3}=\dfrac{8}{27}\)

b: =1,6+2,7-4,2-94*0,7+99*2,7

=100*2,7-100*0,7+1,6

=200+1,6

=201,6

a: \(=\dfrac{4832}{16038}=\dfrac{2416}{8019}\)