a. \(x+x+x+x+x\)
\(=5.x\)
Khi \(x=-5\), ta có:
\(5.\left(-5\right)\)
\(=-25\)
b. \(x-3+x-3+x-3+x-3\)
\(=4.\left(x-3\right)\)
Khi \(x=-5\), ta có:
\(4.\left(-5-3\right)\)
\(=4.\left(-8\right)\)
\(=-32\)
a)x+x+x+x+x=5.x
Khi x bằng -5, ta có
5.(-5)
=(-25)
b) x−3+x−3+x−3+x−3
=4.(x-3)
Khi x = -5, ta có
4.(-5-3)
=4.(-8)
=(-32)
a. x+x+x+x+xx+x+x+x+x
=5.x=5.x
Khi x=−5x=−5, ta có:
5.(−5)5.(−5)
=−25=−25
b. x−3+x−3+x−3+x−3x−3+x−3+x−3+x−3
=4.(x−3)=4.(x−3)
Khi x=−5x=−5, ta có:
4.(−5−3)4.(−5−3)
=4.(−8)=4.(−8)
=−32