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0,2x317x7+ 0,14x3520+ 33,1x 14
= 1,4x 317+ 1,4x352+ 331x1,4
= 1,4 (317+352+331)
= 1,4 x1000
= 1400
![](https://rs.olm.vn/images/avt/0.png?1311)
0,2 x 317 x 7 + 0,14 x 3520 + 33,1 x 14
= 0,2 x 7 x 10 x 31,7 + 0,14 x 100 + 35,2 + 33,1 x 14
= 14 x 31,7 + 14 x 35,2 + 33,1 x 14
= 14 x ( 31,7 + 35,2 + 33,1)
= 14 x 100
= 1400
![](https://rs.olm.vn/images/avt/0.png?1311)
\(BH=\frac{AB.AC}{BC}=\frac{3.4}{5}=\frac{12}{5}=2,4\)
Trung tuyến ứng với cạnh huyền bằng nửa cạnh huyền => MC = 2,5
\(S_{BMC}=\frac{1}{2}MC.BH=3\left(cm^2\right)\)
\(AH=\frac{AB^2}{AC}=\frac{9}{5}=1,8\left(cm\right)\)
\(S_{ABH}=\frac{1}{2}AH.BH=2,16\left(cm^2\right)\)
BK là TPG
\(\frac{AK}{AB}=\frac{KC}{BC}=\frac{AK+KC}{AB+BC}=\frac{5}{7}\)
\(KC=\frac{20}{7}\left(cm\right)\)
\(KM=KC-MC=\frac{20}{7}-2,5=\frac{5}{14}\)
\(S_{BKM}=\frac{1}{2}BH.KM=\frac{3}{7}\)
\(S_{BHK}=S_{ABC}-S_{BKM}-S_{BMC}-S_{BHA}=\frac{72}{175}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,2x317x7+ 0,14x3520+ 33,1x 14= 1,4x 317+ 1,4x352+ 331x1,4= 1,4 (317+352+331)= 1,4 x1000= 1400
![](https://rs.olm.vn/images/avt/0.png?1311)
\(0,2\times317\times7+0,14\times3520+33,1\times14=0,14\times317+0,14\times3520+33,1\times14\)
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
=>\(\frac{1}{100}\cdot\frac{20.317.7+14\cdot3520+3310\cdot14}{2+5+8+...+65-387}=\frac{1}{100}\cdot\frac{14.3170+14.3520+14.3310}{737-387}=\frac{1}{100}\cdot\frac{14.\left(3170++3520+3310\right)}{350}\)\(=\frac{1}{100}\cdot\frac{14.10000}{350}=\frac{14.100}{350}=\frac{7.2.10.2.5}{10.5.7}=2.2=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,2 x 317 x 7 + 0,14 x 3520 + 33,1 x 14
= 0,2 x 7 x 10 x 31,7 + 0,14 x 100 + 35,2 + 33,1 x 14
= 14 x 31,7 + 14 x 35,2 + 33,1 x 14
= 14 x ( 31,7 + 35,2 + 33,1)
= 14 x 100
= 1400
![](https://rs.olm.vn/images/avt/0.png?1311)
0,2 x 317 x 7 + 1,4 x 352 +33,1 x 14=
1,4 x 317 + 1,4x 352 + 331 x1,4 =
1,4x ( 317+ 331+352) =
1,4x 1000 =1400
0,2x317x7+1,4x352+33,1x14
=4,48+492,8+463,4
=497,28+463,4
=960,68
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
\(∘white\)
\( 0 , 2 × 317 × 7 + 0 , 14 × 3520 + 33 , 1 × 14\)
\(= 1 , 4 × 317 + 1 , 4 × 352 + 331 × 1 , 4\)
\(= 1 , 4 × ( 317 + 352 + 331 ) \)
\(= 1 , 4 × 1000\)
\(= 1400\)