Question

[Vũ Ngân Hà]

tính nhanh hộ mình 2 câu này với : 

1*2+2*4+3*6+4*8+5*10 / 3*4+6*8+9*12+12*16+15*20

2*4+2*4*8+4*8*16+8*16*32 / 3*4+2*6*8+4*12*168*24*32

Answer 1

[le bao truc]

a)
\(\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)
\(\frac{2.3\left(1.2\right)+2.3\left(2.4\right)+2.3\left(3.6\right)+2.3\left(4.8\right)+2.3\left(5.10\right)}{3.4\left(3.4+6.8+9.12+12.16+15.20\right)}\)
\(=\frac{\left(3.4+6.8+9.12+12.16+15.20\right)}{2.3\left(3.4+6.8+9.12+12.16+15.20\right)}=\frac{1}{2.3}=\frac{1}{6}\)