\(\dfrac{1.2.4+2.4.8+4.8.16+8.16.32}{1.3.4+2.6.8+4.12.16+8.24.32}\)
\(=\dfrac{8.\left(1+8+4.16+16.32\right)}{12.\left(1+8+4.16+16.32\right)}\)
\(=\dfrac{8}{12}=\dfrac{2}{3}\)
A=\(\frac{1\cdot2\cdot3+2\cdot4\cdot6+4\cdot8\cdot12+8\cdot16\cdot24}{2\cdot2\cdot4+4\cdot6\cdot8+8\cdot12\cdot16+16\cdot24\cdot32}\)
A=
\(B=\frac{2\cdot4+2\cdot4\cdot8+4\cdot8\cdot16+8\cdot16\cdot32}{3\cdot4+2\cdot6\cdot8+4\cdot12\cdot16+8\cdot24\cdot32}\)
So sánh:
\(\frac{2\cdot4+2\cdot4\cdot8+4\cdot8\cdot16+8\cdot16\cdot32}{3\cdot4+2\cdot6\cdot8+4\cdot12\cdot16+8\cdot24\cdot32}\)với \(\frac{202}{304}\)
tính nhanh:
\(\frac{1\cdot2\cdot3+2\cdot4\cdot6+3\cdot6\cdot9+4\cdot8\cdot12}{1\cdot3\cdot4+4\cdot6\cdot8+6\cdot9\cdot12+8\cdot12\cdot16}\)
dấu \(\cdot\)là dấu nhân nha!
so sánh A và B biết
A=\(\frac{1\cdot2+2\cdot4+3\cdot6+4\cdot8+5\cdot10}{3\cdot4+6\cdot8+9\cdot12+12\cdot16+15\cdot20}\)
B=\(\frac{111111}{666665}\)
15. Tính nhanh:
a,\(\frac{3\cdot4\cdot5}{10\cdot2\cdot6}\) b,\(\frac{6\cdot8\cdot12\cdot16}{4\cdot12\cdot8\cdot6}\)
G=\(\frac{1}{1\cdot2}\)+\(\frac{2}{2\cdot4}\)+\(\frac{3}{4\cdot8}\)+\(\frac{4}{7\cdot11}\)+\(\frac{5}{11\cdot16}\)
A = \(\frac{1\cdot2+2\cdot4+3\cdot6+4\cdot8+5\cdot10}{3\cdot4+6,8+9\cdot12+12\cdot6+15\cdot20}\)
B = \(\frac{111111}{666665}\)
so sánh 2 số
tinh nhanh
\(\frac{25\cdot4-0,5\cdot40\cdot5\cdot0,2\cdot20\cdot0,25}{1+2+8+............+129+156}\)
\(\frac{0,5\cdot40-0,5\cdot20\cdot8\cdot0,1\cdot0,25\cdot10}{128:8\cdot16\cdot\left(4+52:4\right)}\)
