Câu hỏi của Công Chúa Lạnh Lùng

Question

Thực hiện phép tính:

a) 4.52 -32:25

b)9.8.14+ 6.(-17)(-12)+19.(-4).18

c)$\left(\dfrac{-1}{2}\right)$3-2.$\left(\dfrac{-1}{2}\right)^{2^{ }}+3.\left(\dfrac{-1}{2^{ }}\right)+1$

Nguyen Thi Huyen · Accepted Answer

a) $4.5^2-32:2^5$

$=4.25-2^5:2^5$

$=100-1$

$=99.$

b) $9.8.14+6.\left(-17\right)\left(-12\right)+19.\left(-4\right).18$

$=9.2.4.14+6.3.\left(-4\right)\left(-17\right)+76.18$

$=18.56+18.68+18.76$

$=18\left(56+68+76\right)$

$=18\left(132+68\right)$

$=18.200$

$=3600.$

c) $\left(\dfrac{-1}{2}\right)^3-2.\left(\dfrac{-1}{2}\right)^2+3.\left(\dfrac{-1}{2}\right)+1$

$=\left(\dfrac{-1}{2}\right)\left[\left(\dfrac{-1}{2}\right)^2+2.\dfrac{-1}{2}+3\right]+1$

$=\left(\dfrac{-1}{2}\right)\left[\dfrac{1}{4}+\left(-1\right)+3\right]+1$

$=\left(\dfrac{-1}{2}\right)\left[\dfrac{1}{4}+2\right]+1$

$=\left(\dfrac{-1}{2}\right).\dfrac{9}{4}+1$

$=\dfrac{-9}{8}+1$

$=\dfrac{-1}{8}$Câu trả lời: a) $4.5^2-32:2^5$