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bị sao d

Toán lớp 3?Sao giống lớp 4,5 hơn!

Ta có:

\(A=\frac{5}{15}+...+\frac{5}{399}\)

\(\Rightarrow A=5.\left(\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{19.21}\right)\)

\(\Rightarrow A=\frac{5}{2}.\left(\frac{1}{3}-\frac{1}{5}+...+\frac{1}{19}-\frac{1}{21}\right)\)

\(\Rightarrow A=\frac{5}{2}.\left(\frac{1}{3}-\frac{1}{21}\right)\)

\(\Rightarrow A=\frac{5}{7}\)

 1 can có số lít mật ong là:

   480:8=60 ( lít)

5 can như thế có số lít là :

 60 x 5 = 300( lít)

   K cho mk nhá

HT

1 can thì có lít mật ong là :

 480 : 8 = 60 ( lít ) 

5 can như thế có số lít là : 

60 x 5 = 300 ( lít )  

Đáp số : 300 lít 

thứ tự từ bé đến lớn là : 1/3 ; 2/3 ; 6/5

1 , 2 , 3, 5 , 6 .

Số trứng nhà Mai biếu bà là :

  2484 x 1/4 = 621 (quả trứng)

Số trứng nhà Mai còn là :

  2484 - 621 = 863 (quả trứng)

  Đáp án : 863 quả trứng.

1863 quả trứng

29 con

14 + 15 =29 ( con )

            Trong phòng có số ghế là:

                  4*5=20(cái ghế)

                        Đáp số:20 cái ghế

trong phòng ăn đó có số cái ghế là

5 nhân 4 = 20 ( cái ghế)

1)mot nam khong tam

2)sau sau ban ban mot nam khong tam

3)ba ret khong ba

4)sau mot nam khong tam

5)sau sau ban ban lam

1) Một năm không tắm.

2) Xấu xấu bẩn bẩn ba năm không tắm.

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