Phương pháp giải:

Tính nhẩm các số rồi điền kết quả vào chỗ trống.

Lời giải chi tiết:

Tính nhẩm:

A = 3.136.8 + 4.14.6 - 14.150

A = 3 x (136 x 8 + 4 x 14 x 2 - 14 x 50)

A = 3 x (1088 + 112 - 700)

A = 3 x 500

A = 1500

tính nhanh

A = 3. 136. 8 + 4. 14. 6 - 14. 150

A = 24 . 136 + 24 . 14 - 14 . 150 

A = 24 ( 136 + 14 ) - 14 . 150

A = 24 . 150 - 14 . 150

A = 150 ( 24 - 14 )

A = 150 . 10

A = 1500 

p-7/10=5/8 bằng bao nhiêu

tính:

3/8+18/5+4

Phương pháp giải:

Tính nhẩm từ trái sang phải rồi điền kết quả vào chỗ trống. 

Lời giải chi tiết:

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a: \(=\dfrac{5}{14}\left(\dfrac{2}{9}+\dfrac{7}{9}+1\right)=\dfrac{5}{14}\cdot2=\dfrac{5}{7}\)

b: \(=\dfrac{6}{8}\left(\dfrac{6}{7}-6\right)=\dfrac{6}{8}\cdot\dfrac{-36}{7}=\dfrac{-216}{56}=\dfrac{-27}{7}\)

a: =-3/24-40/24

=-43/24

b: \(=\dfrac{6}{54}\cdot\dfrac{49}{35}=\dfrac{1}{9}\cdot\dfrac{7}{5}=\dfrac{7}{45}\)

c: \(=\dfrac{6}{5}+\dfrac{4}{3}=\dfrac{18+20}{15}=\dfrac{38}{15}\)

d: \(=\dfrac{31}{17}-\dfrac{14}{17}-\dfrac{5}{13}-\dfrac{8}{13}=1-1=0\)

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Phương pháp giải:

Trừ các số rồi điền kết quả vào chỗ trống.

Lời giải chi tiết:

14 - 8 = 6

14 - 6 = 8

14 - 7 = 7

14 - 9 = 5

14 - 5 = 9