Question

[Quan Thị Gia Linh]

Tính bằng cách thuận tiệ nhất:

a) 2,5 x 8,7 x 4=

b) 2,735 + 1,248 +3,265 + 4,752=

c) 4/13 x 2/3 x 13/4 x 3/2=

Ghi lời giải ra nhé

Answer 1

[Citii?]

a) 2,5 x 8,7 x 4

= 8,7 x (2,5 x 4)

= 8,7 x 10

= 87

b) 2,735 + 1,248 + 3,265 + 4,752

= (2,735 + 3,265) + (1,248 + 4,752)

= 6 + 6 = 12

c) \(\dfrac{4}{13}\times\dfrac{2}{3}\times\dfrac{13}{4}\times\dfrac{3}{2}\)

\(=\dfrac{4}{13}\times\dfrac{13}{4}\times\dfrac{2}{3}\times\dfrac{3}{2}\)

\(=\dfrac{1}{1}\times\dfrac{1}{1}=\dfrac{1}{1}\)

Answer 2

[Cherry 🍒🍒🍒]

a) 2,5 x 8,7 x 4 

= 2,5 x 4 x 8,7

= 10 x 8,7

= 87

b) 2,735 + 1,248 + 3,265 + 4,752

= 2,735 + 3,265 + 1,248 + 4,752

= 6 + 6

= 12

c) \(\dfrac{4}{13}\times\dfrac{2}{3}\times\dfrac{13}{4}\times\dfrac{3}{2}\)

\(=\dfrac{4}{13}\times\dfrac{13}{4}\times\dfrac{2}{3}\times\dfrac{3}{2}\)

= 1 x 1 

= 1