Question

[Thiên An]

Tính giá trị biểu thức sau bằng cách hợp lí

A. 1875 : 2 + 125 : 2 

B. 0 : 36 x( 32 +17+99-68+1 )

C. (m : 1 - m x 1) : (m x 2009 + m + 1)

Answer 1

[Nguyễn Tuấn Tú]

a)
\(1875:2+125:2\\ =1875\times\dfrac{1}{2}+125\times\dfrac{1}{2}\\ =\dfrac{1}{2}\times\left(1875+125\right)\\ =\dfrac{1}{2}\times2000\\ =1000\)

b)
\(0:36\times\left(32+17+99-68+1\right)\\ =0\times\left(32+17+99-68+1\right)\\ =0\)

c)
\(\left(m:1-m\times1\right):\left(m\times2009+m+1\right)\\ =\left(m-m\right):\left(m\times2009+m+1\right)\\ =0:\left(m\times2009+m+1\right)\\ =0\)

Answer 2

[Kiều Vũ Linh]

A. 1875 : 2 + 125 : 2

= (1875 + 125) : 2

= 2000 : 2

= 1000

B. 0 : 36 × (32 + 17 + 99 - 68 + 1)

= 0 × (32 + 17 + 99 - 68 + 1)

= 0

C. (m : 1 - m × 1) : (m × 2009 + m + 1)

= (m - m) : (m × 2009 + m + 1)

= 0 : (m × 2009 + m + 1)

= 0