Question

[nguyễn hữu bảo]

5.tính giá trị các biểu thứ sau

a) \(\left|-2\right|\)-2

b) \(\left|-1,6\right|\).\(\left|3,6\right|\)-\(\left|-2,2\right|\)

c) \(\left|-5,7\right|\)-0,7

d) -\(\left|-\dfrac{2}{5}\right|\)+\(\left|\dfrac{2}{5}\right|\)-(-\(\dfrac{3}{7}\))

Answer 1

[HT.Phong (9A5)]

\(a,\left|-2\right|-2\\ =2-2\\ =0\\ b,\left|-1,6\right|\cdot\left|3,6\right|-\left|2,2\right|\\ =1,6\cdot3,6-2,2\\ =5,76-2,2\\ =3,56\\ c,\left|-5,7\right|-0,7\\ =5,7-0,7\\ =5\\ d,-\left|-\dfrac{2}{5}\right|+\left|\dfrac{2}{5}\right|-\left(-\dfrac{3}{7}\right)\\ =-\dfrac{2}{5}+\dfrac{2}{5}+\dfrac{3}{7}\\ =\dfrac{3}{7}\)