a: \(\frac{7}{10}=0,7;\frac{26}{100}=0,26\)

mà 0,7>0,26

nên \(\frac{7}{10}>\frac{26}{100}\)

b: \(\frac{2}{10}=0,2;\frac{46}{100}=0,46\)

mà 0,2<0,46

nên \(\frac{2}{10}<\frac{46}{100}\)

c: \(\frac{3}{10}=0,3;\frac{30}{100}=0,3\)

Do đó: \(\frac{3}{10}=\frac{30}{100}\)

Câu 1.

ta có: 63/72 =7/8

=>x +3 =7

=>x=...

Câu 2.

=>x +4<11

=>x=0;1;2;3;4;5;6

=>x +4>9

=>x=6;7;8;9;...

=> x=6

a)  \(1284-16401:231+58\)  x\(11=1284-71+638\)

                                                                      \(=1851\)

b)\(\frac{7}{4}+1\frac{1}{2}\)x  \(1\frac{3}{2}:\frac{1}{4}=\frac{7}{4}+15\)

                                              \(=\frac{67}{4}\)

c)\(2\frac{1}{4}+1\frac{2}{5}+\frac{4}{20}\)\(=\frac{9}{4}+\frac{7}{5}+\frac{1}{5}\)

                                            \(=\frac{77}{20}\)

d)\(\left(\frac{12}{5}+\frac{2}{3}-\frac{11}{4}\right):\frac{3}{4}=\frac{19}{60}:\frac{3}{4}\)

                                                    \(=\frac{19}{60}\)x  \(\frac{4}{3}\)

                                                     \(=\frac{19}{45}\)

\(\frac{9}{15}< \frac{9}{17}\)

\(\frac{12}{25}=\frac{36}{75}\)

\(\frac{17}{15}< \frac{5}{4}\)

a) \(\frac{5}{6}< \frac{6}{7}\)

b) \(\frac{5}{8}=\frac{50}{80}\)

c) \(\frac{3}{4}>\frac{5}{7}\)

d) \(\frac{9}{7}< \frac{8}{5}\)

a) <

b) =

c) >

d) <

ủng hộ mk nha

1) < 

2) > 

3) = 

4) <

4/11 < 6/11

6/7 = 12/14

15/17 > 10/17

2/3 < 3/4

nhớ k cho Nhi nha! kết bạn đc thì tốt lun!

\(\frac{23}{12}\)

\(\frac{314}{105}\)

\(\frac{59}{60}\)

\(\frac{199}{90}\)

\(\frac{1}{18}\)

\(\frac{13}{36}\)

\(\frac{4}{221}\)

\(\frac{4}{85}\)

phải giải thích đày đủ

\(\frac{10}{18}+\frac{4}{9}+\frac{26}{10}+\frac{12}{5}+\frac{9}{15}\)

\(=\frac{5}{9}+\frac{4}{9}+\frac{13}{5}+\frac{12}{5}+\frac{3}{5}\)

\(=\left(\frac{5}{9}+\frac{4}{9}\right)+\left(\frac{13}{5}+\frac{12}{5}+\frac{3}{5}\right)\)

\(=1+\frac{28}{5}\)

\(=\frac{33}{5}\)

Ta có:

a) \(\frac{10}{18}+\frac{4}{9}+\frac{26}{10}+\frac{12}{5}+\frac{9}{15}=\frac{5}{9}+\frac{4}{9}+\frac{13}{5}+\frac{12}{5}+\frac{9}{15}=1+1+\frac{9}{15}=1\frac{9}{15}\)

b)\(\frac{10}{18}+\frac{4}{9}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}=\left(\frac{5}{9}+\frac{4}{9}\right)+\left(\frac{16}{128}+\frac{8}{128}+\frac{4}{128}+\frac{2}{128}+\frac{1}{128}\right)\)

\(=1+\frac{31}{128}=1\frac{31}{128}\)

b = 1

a đg nghĩ

@32526313:

Giải bài đầy đủ ra đi bạn =))

Nói đ/a ai chả nói được (:

a, 6/9+5/7+1/3=2/3+5/7+1/3=5/7+1=12/7

b, 17/7+6/5-20/14=17/7+6/5-10/7=6/5+1=11/5

c,2/5x1/4+3/4x2/5=2/5x(1/4+3/4)=2/5x1=2/5

d, 6/11:4/6+5/11:2/3=6/11:2/3+5/11:2/3=(6/11+5/11):2/3=3/2

nha