Question

tính nhanh

1.  2/3 + 4/9 + 1/5 + 2/15 +3/2 - 17/18

2. 13/28 x 5/12 - 5/28 x 1/12

3. 19/4 x 15/23 - 15/4 x 7/23 + 15/4 x 11/23

Answer 1

\(1,\frac{2}{3}+\frac{4}{9}+\frac{1}{5}+\frac{2}{15}+\frac{3}{2}-\frac{17}{18}\)

\(< =>\frac{4}{9}+\frac{3}{2}+\left(\frac{2}{3}+\frac{1}{5}+\frac{2}{15}\right)-\frac{17}{18}\)

\(< =>\frac{8}{18}+\frac{27}{18}+\left(\frac{10}{15}+\frac{3}{15}+\frac{2}{15}\right)-\frac{17}{18}\)

\(< =>\frac{35}{18}+1-\frac{17}{18}\)

\(< =>\frac{53}{18}-\frac{17}{18}\)

\(< =>2\)

\(2,\frac{13}{28}\cdot\frac{5}{12}-\frac{5}{28}\cdot\frac{1}{12}\)

\(< =>\left(\frac{13}{28}-\frac{5}{28}\right)\cdot\left(\frac{5}{12}-\frac{1}{12}\right)\)

\(< =>\frac{2}{7}\cdot\frac{1}{3}\)

\(< =>\frac{2}{21}\)

\(3,\frac{19}{4}\cdot\frac{15}{23}-\frac{15}{4}\cdot\frac{7}{23}+\frac{15}{4}\cdot\frac{11}{23}\)

\(< =>\frac{285}{92}-\frac{105}{92}+\frac{165}{92}\)

\(< =>\frac{15}{4}\)

Answer 2

cảm ơn bạn nha bạn chắc chăn đúng không

Answer 3

bạn viết dấu gạch ngang của phân số như thế nào đấy nguyen thi hien

Answer 4

BAN CHI CAN BAM CHO CONG THUC TOAN LA OK , O TREN CUNG VA BEN PHAI HINH ANH DAY :))\(\)

Answer 5

Đáp án bằng 15/4 Đúng rồi ạ

Answer 6

1• 2/3 + 4/9 + 1/5 +2/15 + 3/2 - 17/18 = 15/

Answer 7

2/3 + 4/9 + 1/5 + 2/15 + 3/2 +- 17/18

Answer 8

jmjmjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj

Answer 9

2/3+ 4/9 +1/5 + 2/15 + 3/2 +17/18= 15/4

Answer 10

Em ko biết làm bài này

Answer 11

1)2/3+4/9+1/5+3/15+3/2+17/18=15/4

Answer 12

1,2/3+4/9+1/5+2/15+3/2+17/18=15/4

Answer 13

15/4 nha

Answer 14

????? không bt

Answer 15

dễ lắm bạn.

Answer 16

bài này là toán lớp 4, bạn lớp nào vậy bạn :)

Answer 17

 1)2/3+4/9+1/5+2/15+3/2−17/18

=(2/3+1/5+2/15)+(4/9+3/2−17/18)

=(10/15+3/15+2/15)+(8/18+27/18−17/18)

=15/15+18/18=1+1=2

2)13/28×5/12−5/28×1/12

=(13/28−5/28)×(5/12−1/12)

=8/28×4/12

=8×4/28×1/2=2/21

3)19/4×15/23−15/4_^x7/23+15/4×11/23

=285/92−105/92+165/92

=345/92=154

Answer 18

ưoa                                gvvvvvvvv 

Answer 19

DJFEIRFEFGRG;JFDLCSFRRLGIR;R 

Answer 20

học thif ng lúc nào cx hỏi

Answer 21

Ko bt nhá :))))

Answer 22

Ngu hỏi lắm

Answer 23

sfggfg

Answer 24

Tìm x x x 45 - x x 38 = 1505

Answer 25

theo công thức toán tính nhanh

Answer 26

bố mày không rảnh

Answer 27

1.  2/3 + 4/9 + 1/5 + 2/15 +3/2 - 17/18

2. 13/28 x 5/12 - 5/28 x 1/12

3. 19/4 x 15/23 - 15/4 x 7/23 + 15/4 x 11/23

Answer 28

có nịt > co2

Answer 29

4.24.5^2-(3^3.18+3^3.12)

31.15.7^2.4-31.49.40

1+2+3+4+5+6+7+8+9+10

1+3+5+7+9+11+13+15+19

2+6+10+14+22+23+26+34

5+8+11+14+17+20+23+26+29

1+6+11+16+21+26+31+36+41+47+51

10+13+16+19+22+25+28+31+34+37+40

5+7+9+11+13+15+17+3+8+13+18+23+28

4+7+10+13+16+19+5+9+13+17+21+25 = 1590 :)))