Question

[Lê Thị Hồng Nhung]

(-25).8.(-4).(-125).3

27.(-17)+17.(-73)

512(2-128)-128(-512)

Answer 1

[Trần Đặng Phan Vũ]

a) \(\left(-25\right).8.\left(-4\right).\left(-125\right).3\)

\(=\text{ }\left[\left(-25\right).\left(-4\right)\right].\text{ }\left[8.\left(-125\right)\right].3\)

\(=100.\left(-1000\right).3\)

\(=-100000.3\)

\(=-300000\)

b) \(27.\left(-17\right)+17.\left(-73\right)\)

\(=\left(-27\right).17+17.\left(-73\right)\)

\(=17\left[\left(-27\right).\left(-73\right)\right]\)

\(=17.\left(-100\right)\)

\(=-1700\)

c) \(512\left(2-128\right)-128\left(-512\right)\)

\(=512.2-512.128-128\left(-512\right)\)

\(=512.2-128\left[512+\left(-512\right)\right]\)

\(=1024-128.0\)

\(=1024-0\)

\(=1024\)

Answer 2

[Hoàng Anh Thư 6a1]

a, (-25).8.(-4).(-125).3

= (-25).(-8).(-4).(-125).(-3)

= {(-25).(-4)}.{(-8).(-125)}.(-3)

= 100.1000.(-3)

= 100000.(-3)

= -300000

b, 27.(-17)+17.(-73)

= 27.17+17.73

= 27.(17+73)

=27.90

=2430

c, 512.(2-128)-128.(-512)

= 512.(-2) - 512.128 - (-128).512

= { 512.{(-2)-128-(-128)}

= 512.{(-2).256}

=512.(-512)

= -262144