Trả lời :

20 + 21 + 22 + 23 + 24 + 25 + 26 + 27 = 188

~ Học tốt ~

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Nhiều vậy

\(\dfrac{11}{34}+\dfrac{5}{23}+\dfrac{23}{34}+\dfrac{18}{23}\)
\(=\left(\dfrac{11}{34}+\dfrac{23}{34}\right)+\left(\dfrac{5}{23}+\dfrac{18}{23}\right)\)
\(=1+1\)
\(=2\)
#DatNe

=2

23 x 27 - 46 x 13 = 23 x 27 - 23 x 26

                          = 23 x ( 27 - 26 )

                          = 23 x 1

                          = 23

chúc bạn học tốt !

=23*27-23*2*13.

=23*27-23*26.

=23*(27-26).

=23*1.

=23.

\(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)

\(=\left(\frac{19}{15}-\frac{4}{15}\right)+\left(\frac{31}{23}-\frac{8}{23}\right)\)

\(=\frac{15}{15}+\frac{23}{23}\)

\(=1+1=2\)

\(\frac{19}{15}+\frac{31}{23}-\frac{14}{15}-\frac{8}{23}\)

\(=\frac{19}{15}-\frac{4}{15}+\frac{31}{23}-\frac{8}{23}\)

\(=1+1=2\)

chúc bạn học giỏi

a) = \(\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right):\dfrac{27}{31}\)

= \(\dfrac{7}{7}\) x \(\dfrac{31}{27}\)

= 1 x \(\dfrac{31}{27}\) = \(\dfrac{31}{27}\)

b) = \(\left(\dfrac{23}{45}:\dfrac{23}{45}\right)\)x \(\dfrac{17}{51}\)

= 1 x \(\dfrac{17}{51}\)= \(\dfrac{17}{51}\)

21+22+23+24+25+26+9+8+7+6+5+4 =180

mình thấy rồng con lon ton làm đúng đấy

21 + 22 + 23 + 24 + 25 + 26 + 9 + 8 + 7 + 6 + 5 + 4

= (21 + 9) + (22 + 8) + (23 + 7) + (24 + 6) + (25 + 5) + (26 + 4)

= 30 + 30 + 30 + 30 + 30 + 30

= 30 x 6

= 180

a: Ta có: 24+35+76+65+22

=(24+76)+(35+65)+22

=222

b: Sửa đề: \(24\cdot35+24\cdot65\)

=24x100

=2400

hihi

a , 25 + 35 + 76 +65 + 22
= 25+(35+65)+(76+22)
=25+100+100
=225

b , 24 + 25  + 24 x 22
=24(1+22)+25
=552+25
=577

c , 78 - 23 - 25
=78-(23+25)
=78-48
=30

bài b sai pk cj ạ tự dưng 76 + 22 lại bằng 100 ??

12345 x 17 + 23 x 12345 + 12345 + 12345 x 35 + 12345 x 24

12345 x ( 17 + 23 + 35 + 24 )

12345 x 99

1222155

= 12345 x 17 + 23 x 12345 + 12345 x 1 + 12345 x 35 + 12345 x 24

= 12345 x ( 17 + 23 + 1 + 35 + 24 )

= 12345 x 100

= 1234500