6246865,2

=>63,4x7+0,14x3520+33,1x4

=>443,8+492,8+132,4

=>936,6+132,4

=>1069

0,2x317x7+ 0,14x3520+ 33,1x 14= 1,4x 317+ 1,4x352+ 331x1,4= 1,4 (317+352+331)= 1,4 x1000= 1400

khong biet

\(0,2\times317\times7+0,14\times3520+33,1\times14=0,14\times317+0,14\times3520+33,1\times14\)

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

=>\(\frac{1}{100}\cdot\frac{20.317.7+14\cdot3520+3310\cdot14}{2+5+8+...+65-387}=\frac{1}{100}\cdot\frac{14.3170+14.3520+14.3310}{737-387}=\frac{1}{100}\cdot\frac{14.\left(3170++3520+3310\right)}{350}\)\(=\frac{1}{100}\cdot\frac{14.10000}{350}=\frac{14.100}{350}=\frac{7.2.10.2.5}{10.5.7}=2.2=4\)

= (0,2 x 5) x 38,6

= 1 x 38,6 

= 38,6

=38.6x(0.2x5)

=38.6x1=38.6

 0,2 x 38,6 x 5 

= ( 0,2 x 5 ) x 38,6

= 1 x 38,6

= 38,6

hình như là         33177600

mọi người tk ủng hộ mk nha

0,2x317x7+ 0,14x3520+ 33,1x 14

= 1,4x 317+ 1,4 x 352 + 331 x 1,4

= 1,4 x (317 + 352 + 331)

= 1,4 x 1000

= 1400

\(∘white\)

\( 0 , 2 × 317 × 7 + 0 , 14 × 3520 + 33 , 1 × 14\)

\(= 1 , 4 × 317 + 1 , 4 × 352 + 331 × 1 , 4\)

\(= 1 , 4 × ( 317 + 352 + 331 ) \)

\(= 1 , 4 × 1000\)

\(= 1400\)

a)(-2,5 x 0,38 x 0,4) - [0,125 x 3,15 x (-8)]

=[(-2,5 x 0,4) x 0,38] - [(-8 x 0,125) x 3,15]

=(-1 x 0,38) - (-1 x 3,15)

=(-0,38) - (-3,15)

=2,77

a) 2,77

b)-2