78/42-4/7=13/7-4/7=9/7

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3/11x2=6/11

6/11:3/11=2

6/11:2=3/11

2x3/11=6/11

tk mk nha

3 / 11 x 2 = 6 /11

6 /11 x 3/11 = 6/3

6 / 11: 2 = 12/11

2x 3/11 = 6/11

\(\frac{3}{11}\) x 2 = \(\frac{6}{11}\)

\(\frac{6}{11}\) : \(\frac{3}{11}\) = \(\frac{6}{11}\) x \(\frac{11}{3}\) = \(\frac{66}{33}\) = 2

\(\frac{6}{11}\) : 2 = \(\frac{6}{11x2}\) = \(\frac{6}{22}\) = \(\frac{3}{11}\)

2 x \(\frac{3}{11}\) = \(\frac{2x3}{11}\) = \(\frac{6}{11}\)

tk mk vs gửi kết bn nha các bn

cảm ơn các bn

\(=8x^3+27-8x^3-7=20\)

bằng 20

\(\frac{3}{4}+\frac{1}{6}=\frac{9+2}{12}=\frac{11}{12}\)

\(\frac{11}{12}-\frac{3}{4}=\frac{11-9}{12}=\frac{2}{12}=\frac{1}{6}\)

\(\frac{11}{12}-\frac{1}{6}=\frac{11-2}{12}=\frac{9}{12}=\frac{3}{4}\)

\(\frac{1}{6}+\frac{3}{4}=\frac{2+9}{12}=\frac{11}{12}\)

a: 78/42-4/7=13/7-4/7=9/7

100/110-56/88=10/11-7/11=3/11

75/35-11/7+21/49=15/7-11/7+3/7=7/7=1

99/72-15/40-1212/1616=11/8-3/8-3/4=1-3/4=1/4

kết quả của mình là:16493,1

kết quả của bài trên là:

243,45x800x2=16578

đáp số:16578

=>(x . 3 -8)=7 . 4

=>x . 3-8 =28

=.x.3 = 28+8

=>x.3= 36

=>x=36:3

=>x=12

(x . 3 - 8):4 = 7

x.3 - 8 = 7 . 4 = 28

x.3 = 28 + 8 = 36

x = 36:3 = 12

a: =24/15-18/15=6/15=2/5

b: =78/42-24/42=54/42=9/7

c: =30/36-12/36=18/36=1/2

d: =7/8-1/8-3/34=6/8-3/34=3/4-3/34=45/68

a)2/3x4/7=8/21

b)8/21:2/3=8/21x3/2=24/42=4/7

c)8/21:4/7=8/21x7/4=56/85=7//12

d)4/7X2/3=8/21

a)\(\frac{2}{3}\cdot\frac{4}{7}=\frac{8}{21}\)

b)\(\frac{8}{21}:\frac{2}{3}=\frac{8}{21}\cdot\frac{3}{2}=\frac{4}{7}\)

c)\(\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\cdot\frac{7}{4}=\frac{2}{3}\)

d)\(\frac{4}{7}\cdot\frac{2}{3}=\frac{8}{21}\)

2/3 x 4/7 = \(\frac{2.4}{3.7}=\frac{8}{21}\)

\(\frac{8}{21}:\frac{4}{7}=\frac{8\times7}{21\times4}=\frac{56}{84}=\frac{2}{3}\)

\(\frac{8}{21}:\frac{2}{3}=\frac{8\times3}{21\times2}=\frac{24}{42}=\frac{4}{7}\)

\(\frac{4}{7}\times\frac{2}{3}=\frac{4\times2}{7\times3}=\frac{8}{21}\)