Viết lại câu:
He is as old as his friend ( age )
=> He is the .....

17x (800:10)
= 17x80
= 1360

Tìm x,y,z biết :
x:y:z= 2:3:5 và x*y*z =810
Giúp mik với

36*(-17)-36*83
= 36* [(-17)-83]
= 36* (-100)

= -3600

a/ 5*\(\sqrt{0,01}-\sqrt{0,25}\)

= 5*\(\dfrac{1}{10}-\dfrac{1}{2}\)

= \(\dfrac{1}{2}-\dfrac{1}{2}\)

= 0

b/\(15\dfrac{1}{4}\): (-\(\dfrac{5}{7}\))- 25\(\dfrac{1}{4}\):(-\(\dfrac{5}{7}\))
= 15\(\dfrac{1}{4}\)* (\(\dfrac{-7}{5}\)) - 25\(\dfrac{1}{4}\)*(\(\dfrac{-7}{5}\))
= (\(\dfrac{-7}{5}\))* (15\(\dfrac{1}{4}\) - 25\(\dfrac{1}{4}\))
= (\(\dfrac{-7}{5}\))* (-10)
= 14
Chúc bạn học tốt !!