Question

A= 2.3+2.4+2.5+2.6+2.7+4.15

Trả lời giúp mình nhé

Answer 1

A= 2.3+2.4+2.5+2.6+2.7+4.15

   = 2.(3+4+5+6+7)+4.15

   = 2.25+4.15

   = 50+60

   = 110

Answer 2

A=2.3+2.4+2.5+2.6+2.7+2.2.15

A=2.3+2.4+2.5+2.6+2.7+2.30

A=2.(3+4+5+6+7+30)

A=2.\(\left[\left(3+7\right)+\left(4+6\right)+5+30\right]\)

A=2.(10+10+5+30)

A=2.55

A=110

Answer 3

\(A=2\cdot3+2\cdot4+2\cdot5+2\cdot6+2\cdot7+4\cdot15\\=2\cdot3+2\cdot4+2\cdot5+2\cdot6+2\cdot7+2\cdot2\cdot15\\ =2\cdot3+2\cdot4+2\cdot5+2\cdot6+2\cdot7+2\cdot30\\ =2\left(3+4+5+6+7+30\right)\\ =2\left[\left(3+7\right)+\left(4+6\right)+\left(5+30\right)\right]\\ =2\left[10+10+35\right]\\ =2\cdot55\\ = 110\)

Answer 4

A= 2.3+2.4+2.5+2.6+2.7+4.15

   = 2.(3+4+5+6+7)+60

   = 2.25+60

   = 50+60

   = 110