rut gon bang 3/4

tk nha điểm hỏi đáp của mình thấp lắm

bằng \(\frac{3}{4}\) tk cho mik nha

Rút gọn : 

\(\frac{51}{68}=\frac{51:17}{68:17}=\frac{3}{4}\)

Vậy \(\frac{51}{68}=\frac{3}{4}\)

chúc học tốt

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

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

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

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

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

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

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

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

Rút gọn:

\(\frac{35}{45}=\frac{35}{45}:\frac{5}{5}=\frac{7}{9}\)

HT

35/45 = 35 : 5 / 45 : 5 = 7/9 nhé

Rút gọn PS :

35/45 = 35/45 : 5/5 = 7/9

TL

\(B=x\sqrt{2}.\sqrt{\left(x\sqrt{2}\right)^2+2x\sqrt{2}.1+1}=x\sqrt{2}\sqrt{\left(x\sqrt{2}+1\right)^2}=x\sqrt{2}Ix\sqrt{2}+1I\)

D

D?

D

X+21+(-18)+(-40)=x+21-18-40=x-37

-55-(y+

a) x + 21 + (-18) + (-40)

= x + 21 - 18 - 40

= x - 37

b) -55 - (y + 20) - (-55)

= -55 -y - 20 + 55

= - y - 20

c) -(a - b) + ( a - c -d + b )

= - a + b + a -c - d +b 

= 2b - c - d

-55-(y+20)-(-55)=-55-y-20+55=0-y-20=-(y+20)

-(a-b)+(a-c-d+b)

=2b-c-d

= =8/5

Ta có: \(-\frac{72}{45}=\frac{-72:9}{45:9}=\frac{-8}{5}\)

\(\frac{9}{21}=\frac{9:3}{21:3}=\frac{3}{7}\)

\(-\frac{16}{44}=\frac{-16:4}{44:4}=-\frac{4}{11}\)

\(\frac{-15}{-35}=\frac{-15:\left(-5\right)}{-35:\left(-5\right)}=\frac{3}{7}\)

\(\frac{-20}{-55}=\frac{-20:\left(-5\right)}{-55:\left(-5\right)}=\frac{4}{11}\)

\(-\frac{32}{20}=\frac{-32:4}{20:4}=-\frac{8}{5}\)