a: =35/17-18/17-9/5+4/5

=1-1=0

b: =-7/19(3/17+8/11-1)

=7/19*18/187=126/3553

c: =26/15-11/15-17/3-6/13

=1-6/13-17/3

=7/13-17/3=-200/39

A, 476/429

B, 1/5

2250 kg rau

A. \(\frac{476}{429}\)

B. \(\frac{1}{5}\)

a) 21/11.22/17.68/63

=21/11.11.2/17.17.4/3.21

=21.11.2.17.4/11.17.3.21

=8/3

b) 5/14.7/13.26/25

=5/2.7.7/13.2.13/5.5

=5.7.2.13/2.7.13.5.5

=1/5

3/5x4/7=12/35

12/35:3/5=4/7

12/35:4/7=3/5

4/7x3/5=12/35

a,12/35

4/7

3/5

12/35

b,26/11

2

13/11

26/11

26/111 chia 13/11 gõ sai kìa  phải là 26/11 chia 13/11 

a) \(\frac{3}{5}\times\frac{4}{7}=\frac{3\times4}{5\times7}=\frac{12}{35}\)

\(\frac{12}{35}:\frac{3}{5}=\frac{12\times5}{35\times3}=\frac{60}{105}=\frac{4}{7}\)

\(\frac{12}{35}:\frac{4}{7}=\frac{12\times7}{35\times4}=\frac{84}{140}=\frac{3}{5}\)

\(\frac{4}{7}\times\frac{3}{5}=\frac{4\times3}{7\times5}=\frac{12}{35}\)

b) \(\frac{13}{11}\times2=\frac{13}{11}\times\frac{2}{1}=\frac{13\times2}{11\times1}=\frac{26}{11}\)

\(\frac{26}{111}:\frac{13}{11}=\frac{26\times11}{111\times11}=\frac{286}{1221}=\frac{26}{111}\)

\(\frac{26}{11}:2=\frac{26}{11}:\frac{2}{1}=\frac{26\times1}{11\times2}=\frac{26}{22}=\frac{13}{11}\)

\(2\times\frac{13}{11}=\frac{2}{1}\times\frac{13}{11}=\frac{2\times13}{1\times11}=\frac{26}{11}\)

bạn ơi bằng 476 phần 429

476 phần 429 nha ^_^

k mình nha -_-       >_<      ^_^

5/7x11/13x26=55/91x26=110/7

Đáp án:

C1:

5/7x11/13x26

=55/91x26

=110/7

C2:

5/7x11/13x26

=(5/7x26)x11/13

=130/7x11/13

=110/7

HT!!!

và 7/9 nhân 5/2 cộng 4/9 nhân 5/2