\(A=\frac{3333}{4545}+\frac{36}{45}+\frac{666666}{454545}\)

   \(=\frac{33}{45}+\frac{36}{45}+\frac{66}{45}\)

   \(=\frac{69}{45}+\frac{66}{45}\)

   \(=3\)

Vậy A = 3

#hoctot

bạn có chắc ko

chắc 100% / 100%

Tớ rút gọn luôn :))

\(\frac{45}{57}=\frac{15}{19}\)

\(\frac{4545}{5757}=\frac{4545:11}{5757:11}=\frac{15}{19}\)

\(\frac{454545}{575757}=\frac{454545:11}{575757:11}=\frac{15}{19}\)

Vì \(\frac{15}{19}=\frac{15}{19}=\frac{15}{19}\)

=> 3 phân số bằng nhau

Bang:  454545⁹⁴⁰¹⁷⁸

466 657 nha bạn

tk mình nha bạn

thank you bạn

12112+454545=466657

k mình nha Haibara Ai

12112+454545=466657

k minh nhe

mình chúc bạn vui!

Câu 3 : Tính

a) 74,15 + 4,05 : 2,5

= 74,15 + 1,62 

= 75,77

b) 100 - 2,6 x 3,9 + 20,97 

= 100 - 10,14 + 20,97 = 110,83

Câu 4: Tính nhanh

a) \(\dfrac{1}{2}\) + \(\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+\dfrac{1}{32}+\dfrac{1}{64}\)

= 2 x (1 - 1/2 + 1/2 - 1/4 + 1/4 - 1/8 + 1/8 - 1/16 + 1/16 - 1/32 + 1/32 - 1/64)

= 2 x (1 - 1/64)

= 2 x 63/64

= 63/32

- Phần còn lại mình sẽ làm sau nhé bạn!

#ebehotmebiocd

#olm.vn

#Toán-5

Câu 3:

a, 74,15 + 4,05 : 2,5

= 74,15 + 1,62

= 75,77

b, 100 - 2,6 x 3,9 + 20,97

= 100 - 10,14 + 20,97

= 89,86 + 20,97

= 110,83

Câu 4:

a, A =  \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\) + \(\dfrac{1}{64}\)

  2A = 1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\)

2A - A = 1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\) - (\(\dfrac{1}{2}\)+\(\dfrac{1}{4}\)+\(\dfrac{1}{8}\)+\(\dfrac{1}{16}\)+\(\dfrac{1}{32}\)+\(\dfrac{1}{64}\))

A = 1 +\(\dfrac{1}{2}\)+\(\dfrac{1}{4}\)+\(\dfrac{1}{8}\)+\(\dfrac{1}{16}\)+\(\dfrac{1}{32}\)-\(\dfrac{1}{2}\)-\(\dfrac{1}{4}\)-\(\dfrac{1}{8}\)-\(\dfrac{1}{16}\)-\(\dfrac{1}{32}\) - \(\dfrac{1}{64}\)

A = 1 -  \(\dfrac{1}{64}\)

\(\dfrac{989898}{454545}-\dfrac{31313131}{15151515}=\dfrac{98\cdot10101}{45\cdot10101}-\dfrac{31\cdot1010101}{15\cdot1010101}\\ =\dfrac{98}{45}-\dfrac{31}{15}=\dfrac{98-31\cdot3}{45}=\dfrac{5}{45}=\dfrac{1}{9}\)

\(\dfrac{1}{9}\)

bằng 0 nhé

200x454545:0=0( k mink nhé ^-^)

200 x 454545 : 0

= 200 x 0

= 0

k mình nha mình âm điểm rồi