\(100-98+96-94+.\ldots+24-22+20\)

\(=\left(100-98\right)+\left(96-94\right)+\cdots+\left(24-22\right)+20\)

\(=2+2+\ldots+2+20\) (có 20 số hạng 2)

\(=20.2+20=20.3\)

\(=60\)

60 nha bạn

\(\frac{2}{5}=\frac{12}{30}=\frac{40}{100}\)

\(\frac{4}{7}=\frac{12}{21}=\frac{20}{35}\)

nha

anh bn

\(\frac{2}{5}\)\(=\)\(\frac{12}{30}\)\(;\)\(\frac{4}{7}\)\(=\)\(\frac{12}{21}\)\(Done\)

Bang 21 nha chuc ban hoc tot

1.A

2.C

HT

A.\(\frac{101}{100}\)

C. \(\frac{1}{2}\)

\(\frac{48}{96}=\frac{48:48}{96:48}=\frac{1}{2}\)

\(\frac{42}{98}=\frac{42:14}{98:14}=\frac{3}{7}\)

\(\frac{80}{240}=\frac{80:80}{240:80}=\frac{1}{3}\)

\(\frac{75}{100}=\frac{75:25}{100:25}=\frac{3}{4}\)

\(\frac{64}{720}=\frac{64:16}{720:16}=\frac{4}{45}\)

\(\frac{15}{120}=\frac{15:15}{120:15}=\frac{1}{8}\)

48/96=1/2

42/98=3/7

80/240=1/3

75/100=3/4

64/720=4/45

15/120=1/8

`6/10=3/5`

`70/9=70/9`

`96/72=4/3`

`45/35=9/7`

`24/36=2/3`

`25/100=1/4`

$6/10=(6:2)/(10:2)=3/5$

$70/9$ ( tối giản)

$96/72=(96:24)/972:24)=4/3$

$45/35=(45:5)/(35:5)=9/7$

$24/36=(24:12)/(36:12)=2/3$

$25/100=(25:25)/(100:25)=1/4$

đừng ra linh tinh

4/5=44/55

6/7=30/35=54/63

3/10=21/70=30/100

100 ví 100