được nhé bạn

`84 / 252 = [ 84 : 84 ] / [ 252 : 84 ] = 1 / 3`

Bằng 1/3

\(\dfrac{90}{120}=\dfrac{30.3}{30.4}=\dfrac{3}{4}\)

\(\dfrac{15}{25}=\dfrac{5.3}{5.5}=\dfrac{3}{5}\)

\(\dfrac{18}{45}=\dfrac{9.2}{9.5}=\dfrac{2}{5}\)

\(\dfrac{36}{64}=\dfrac{4.9}{4.16}=\dfrac{9}{16}\)

\(\dfrac{32}{72}=\dfrac{8.4}{8.9}=\dfrac{4}{9}\)

\(\dfrac{84}{49}=\dfrac{7.12}{7.7}=\dfrac{12}{7}\)

\(\dfrac{90}{120}=\dfrac{3}{4};\dfrac{15}{25}=\dfrac{3}{5};\dfrac{18}{45}=\dfrac{2}{5};\dfrac{36}{64}=\dfrac{9}{16};\dfrac{32}{72}=\dfrac{4}{9};\dfrac{84}{49}=\dfrac{12}{7}\)

\(\dfrac{3}{4},\dfrac{3}{5},\dfrac{2}{5},\dfrac{9}{16},\dfrac{4}{9},\dfrac{12}{7}\)

làm gì có phân số nào?

Tao tưởng mày làm được rồi còn gì

đấy là hôm qua lúc 9 giờ hôm qua nha con đĩ

30/84 rút gọn thành 5/14

30/84 = 15/42 = 5/14

5/14 nha

hok tốt

123

(√28 - 2√3 + √7)√7 + √84

= (√4.7 - 2√3 + √7)√7 + √4.21

= (2√7 - 2√3 + √7)√7 + 2√21

= (3√7 - 2√3)√7 + 2√21

= 3.7 - 2√21 + 2√21 = 21

808/909=8/9

111/333=1/3=3/9

202/303=2/3

8/9+3/9-2/9=11/9-2/9

                  =9/9=1

            Học tốt               

8/9 + 37/111 + -2/3

Tự làm nha

808/909+111/333-202/303=8/9+1/3+2/3=8/9+1=17/9

tổng bằng \(\frac{5}{9}\)

\(\frac{808}{909}+\frac{111}{333}+\left(-\frac{202}{303}\right)\)

\(=\frac{8}{9}+\frac{1}{3}-\frac{2}{3}\)

\(=\frac{8}{9}+\frac{3}{9}-\frac{6}{9}\)

\(=\frac{5}{9}\)

\(\frac{808}{909}+\frac{111}{333}+\frac{-202}{303}\)

\(=\frac{8}{9}+\frac{1}{3}+\frac{-2}{3}=\frac{8}{9}+\frac{1+(-2)}{3}=\frac{8}{9}+\frac{-1}{3}=\frac{24+(-9)}{27}=\frac{15}{27}=\frac{5}{9}\)

\(\frac{12}{84}+\frac{36}{63}\)

\(=\frac{1}{7}+\frac{4}{7}=\frac{5}{7}\)

học tốt ~~~

\(\frac{12}{84}=\frac{1}{4}\)

\(\frac{36}{63}=\frac{4}{7}\)

Ta có : 

\(\frac{1}{4}=1-\frac{3}{4}\)

\(\frac{4}{7}=1-\frac{3}{7}\)

Mà \(\frac{3}{4}>\frac{3}{7}\) nên \(\frac{1}{4}< \frac{4}{7}\)

\(\Rightarrow\) \(\frac{12}{84}< \frac{36}{63}\) .

1/7 + 4/7 =5/7

`72/84 = (72:12)/(84:12) = 6/7`

`72/84=(72:12)/(84:12)=6/7`

72/84=6/7