\(\frac{22}{77}+\frac{56}{98}+\frac{25}{105}\)

\(\frac{2}{7}+\frac{4}{7}+\frac{5}{21}\)

\(\frac{23}{21}\)

2/7 +4/7+5/21=6/7+5/21=23/21

Đúng ko bạn ?

a)\(\dfrac{22}{25}+\dfrac{25}{125}+\dfrac{36}{96}\)
\(=\dfrac{22}{25}+\dfrac{1}{5}+\dfrac{3}{8}\)
\(=\dfrac{176}{200}+\dfrac{40}{200}+\dfrac{75}{200}\)
\(=\dfrac{291}{200}\)
b)\(\dfrac{22}{77}+\dfrac{56}{98}+\dfrac{25}{105}\)
\(=\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{5}{21}\)
\(=\dfrac{6}{7}+\dfrac{5}{21}\)
\(=\dfrac{18}{21}+\dfrac{5}{21}=\dfrac{23}{21}\)

Ngu như con cặc

=2/7+4/7+5/21

=6/21+12/21+5/21

=18/21+5/21

=23/21

ʇɐɥʇ ɥuɐɹ uɐq ɔɐɔ ɐl ƃunp ıɥʇ ʎɐp uǝp ɔonp ɔop uɐq ɔɐɔ ɐl ʇǝıq ɥuıɯ ƃunɥu 'ɔonp ɔop ıoɯ ıɐl ɔonƃu ʎɐox ıɐɥd ɐʌ ɔop oɥʞ ɐl ʇɐɹ ıɥʇ ʎɐu ǝɥʇ ʇǝıʌ ɐl ʇǝıq ɥuıɯ

23/21

a. \(\frac{22}{55}\)+ \(\frac{25}{125}\)+ \(\frac{1020}{5100}\)

= \(\frac{2}{5}\)+ \(\frac{1}{5}\)+ \(\frac{1}{5}\)

= \(\frac{4}{5}\)

B. \(\frac{22}{77}\)+ \(\frac{56}{98}\)+ \(\frac{25}{105}\)

= \(\frac{2}{7}\)+ \(\frac{4}{7}\)+ \(\frac{5}{21}\)

= \(\frac{6}{7}\)+ \(\frac{5}{21}\)

= \(\frac{23}{21}\)

23/21 bn nhé

ai lớp 4 hoặc 5 kb mik nhé mik luôn sẵn sàng

= 23 | 21 nhé bạn

mình hứa sẽ tick

= 2/5 + 1/5 + 1/5

= 4/5

b. = 2/7 + 4/7 + 5/21

= 6/21 + 12/21 + 5/21

= 23/21

HT

\(\frac{74-x}{26}+\frac{75-x}{25}+\frac{76-x}{24}+\frac{77-x}{23}+\frac{78-x}{22}=-5\)

\(\frac{74-x}{26}+1+\frac{75-x}{25}+1+\frac{76-x}{24}+1+\frac{77-x}{23}+1+\frac{78-x}{22}=-5+5\)

\(\frac{74-x}{26}+\frac{26}{26}+\frac{75-x}{25}+\frac{25}{25}+\frac{76-x}{24}+\frac{24}{24}+\frac{77-x}{23}+\frac{23}{23}+\frac{78-x}{22}+\frac{22}{22}=0\)

\(\frac{100-x}{26}+\frac{100-x}{25}+\frac{100-x}{24}+\frac{100-x}{23}+\frac{100-x}{22}=0\)

\(\left(100-x\right)\left(\frac{1}{26}+\frac{1}{25}+\frac{1}{24}+\frac{1}{23}+\frac{1}{22}\right)=0\)

=>100-x=0    ( \(\left(\frac{1}{26}+\frac{1}{25}+\frac{1}{24}+\frac{1}{23}+\frac{1}{22}\right)\ne0\))

x=100

hahaha

Cộng 1 vào mỗi hạng tử trong vế trái là dc

ra kết quả thui nhé! 

a/ 120

b/ -100

c/ 430

d/ -98

e/ A=-32

f/ B=1/10

tik nhá

bài 2 :                                 bài giải

                số trứng gà là:

                             42:(5+9)*5=15 (con gà)

                số trứng vịt là:

                              42-15=27 (con vịt)

                                              đáp số :15 con gà

                                                            27 con vịt

mình chỉ biết bài 2 thôi nhé              dấu " * "là nhân nha

a)     5/30+15/90+25/150+35/210+45/270

       =1/6+1/6+1/6+1/6+1/6

       =1/6 x 5

       =5/6

b)     1/2+1/6+1/12+1/20+....+1/56

        =1/1x2+1/2x3+1/3x4+1/4x5+.....1/7x8

        =1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.......-1/7+1/7-1/8

        =1/1-1/8

         =7/8

c)     mình chịu

thank you bn nhìu nha

chịu,khó quá,nhất là câu c ý