\(0,2\times317\times7+0,14\times3520+33,1\times14=0,14\times317+0,14\times3520+33,1\times14\)
Tương đương với: \(14\times3,17+14\times35,20+33,1\times14=14\times\left(3,17+35,20+33,1\right)=14\times71,44\)
=1000,16
2+5+8+...+65 = \(\frac{\left(65-2\right):3+1}{2}.\left(65+2\right)=11.67=737\)
=> 2+5+8+...+65 - 387 = 737 - 387 = 350
Vậy kết quả là \(\frac{1000,16}{350}=2,8576\)
\(\frac{0,2x317x7+0,14x3520+33,1x14}{2+5+8+...+65-387}=\frac{1}{100}\cdot\frac{20.317.7+14\cdot3520+3310\cdot14}{2+5+8+...+65-387}\)
Ta có:2+5+8+...+65 có (65-2):3+1=22(số hạng)
=>2+5+...+65=(2+65).22:2=737
=>\(\frac{1}{100}\cdot\frac{20.317.7+14\cdot3520+3310\cdot14}{2+5+8+...+65-387}=\frac{1}{100}\cdot\frac{14.3170+14.3520+14.3310}{737-387}=\frac{1}{100}\cdot\frac{14.\left(3170++3520+3310\right)}{350}\)\(=\frac{1}{100}\cdot\frac{14.10000}{350}=\frac{14.100}{350}=\frac{7.2.10.2.5}{10.5.7}=2.2=4\)
