Question

[Kiều trang]

bai1:tinh 

a) (-10):(-5)x (-25) x20

b) (-32-15): (-5)

c) (-42+8)x(-6)

bai 2: tim so nguyen x biet

a)2x\(x-35=15\)

b)\(|-45|\)\(-x=20\)

mik se tik cho 3 bn nhanh nhat nha!

Answer 1

[Xyz OLM]

1) tính 

a) (-10) : (-5) x (-25) x 20

= 2 x (- 25) x 20

= (- 50) x 20

= - 1000

b) (- 32 - 15) : (-5)

= (-47) : (-5)

= \(\frac{47}{5}\)

c) (-42 + 8) x (-6)

= (- 34) x (- 6)

= 204

2) tìm x

a) \(2\times x-35=15\)

=> \(2\times x=15+35\)

=> \(2\times x=50\)

=> \(x=50:2\)

=> \(x=25\)

b) \(\left|-45\right|-x=20\)

=> \(45-x=20\)

=> \(x=45-20\)

=> \(x=25\)

Answer 2

[T.Ps]

#)Giải :

Bài 1 :

a)\(\left(-10\right):\left(-5\right).\left(-25\right).20\)

\(=2.\left(-500\right)\)

\(=-1000\)

b)\(\left(-25-15\right):\left(-5\right)\)

\(=\left(-40\right):\left(-5\right)\)

\(=8\)

c)\(\left(-42+8\right).\left(-6\right)\)

\(=\left(-34\right).\left(-6\right)\)

\(=216\)

Bài 2 :

a)\(2x-35=15\)

\(2x=50\)

\(x=25\)

b)\(\left|-45\right|-x=20\)

\(\orbr{\begin{cases}\left|-45\right|>0\\\left|-45\right|< 0\end{cases}\Rightarrow\orbr{\begin{cases}45-x=20\\-45-x=20\end{cases}\Rightarrow}\orbr{\begin{cases}x=25\\x=-65\end{cases}}}\)