Ta có:

\(\left(x^2-16\right)\left(x+3\right)=0\)

\(\Rightarrow\orbr{\begin{cases}0.\left(x+3\right)=0\\\left(x^2-16\right).0=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x+3=0\\x^2-16=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=0-3\\x^2=0+16\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\left(-3\right)\\x^2=16\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\left(-3\right)\\x^2=\left(\pm4\right)^2\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\left(-3\right)\\x=\left(\pm4\right)\end{cases}}\)

Vậy \(x\in\left\{\pm4;-3\right\}\)

@Nghệ Mạt

#cua

\(x-5.\left(-6\right)=-4.\left(-9\right)\)

\(x-5\left(-6\right)-4\left(-9\right)\)

\(x+30==-4\left(-9\right)\)

\(x+30=36\)

\(x=36-30\)

\(x=6\)

\(7.\left(-8\right)+x=4.\left(-12\right)\)

\(7\left(-8\right)+x=4\left(-12\right)\)

\(-56+x=4\left(-12\right)\)

\(x-56=4\left(-12\right)\)

\(x-56=-48\)

\(x=-48=56\)

\(x=8\)

\(\left(-23\right).\left(-5\right)-x=49.\left(-2\right)\)

\(-23\left(-5\right)-x=49\left(-2\right)\)

\(115-x=49.\left(-2\right)\)

\(-x+115=49.\left(-2\right)\)

\(-x+115=-98\)

\(-x=-98-115\)

\(-x=-213\)

\(x=213\)

quá dễ giốt bằng 

1) -35 . 1753 + (-35) . 247 + (-35) . (-1996)

= [ (-35) - (-35) ] .  ( 1753 + 247 ) + (-1996)

= 0 . 2000 + (-1996)

= 0 + (-1996) 

= -1996

2) 4 . 125 . (-25) . (-8)

= [ ( -25) . 4 ] . [ 125 . (-8)]

= -100 . -1000

= 100 000

1. 

\(-35.1753+\left(-35\right).247+\left(-35\right).\left(-1996\right)=-35.\left(1753+247-1996\right)\)

\(=-35.4=-140\)

2. \(4.125.\left(-25\right).\left(-8\right)=\left(-25.4\right).\left(-8.125\right)=\left(-100\right).\left(-1000\right)=100\text{ }000\)

a. ta có \(2019.\left(-2\right)< 0\)

b. \(\left(-2018\right).\left(-2019\right)>0\)

c. \(\left(-1\right).\left(-2\right)\left(-3\right)..\left(-2020\right)>0\)

( x-3) ³ = 24 - ( -3) 

( x-3) ³ = 27

( x-3) ³ = 3³ 

x-3 = 3

x = 3+3

x=6

Bài 1: Tính hợp lý (nếu có thể)

a) 5.(-8).(-2).(-3)\(=\left(-2.5\right).\left(\left(-3\right).\left(-8\right)\right)=-10.24=-240\)

c) 147.333+233.(-147)\(=147\left(333-233\right)=147.100=14700\)

b) (-125).8.(-2).5.19\(=\left(-125.8\right).\left(-2.5\right).19=-1000.\left(-10\right).19=190\text{ }000\)

d) (-115).27+33.(-115)\(=-115.\left(27+33\right)=-115.60=-6900\)

Bài 2: Tìm số nguyên x, biết: 

a) 2x+19=15\(\Leftrightarrow2x=15-19=-4\Leftrightarrow x=-2\)

c) 24-(x-3)^3=-3\(\Leftrightarrow\left(x-3\right)^3=27=3^3\Leftrightarrow x-3=3\Leftrightarrow x=6\)

12987 -x- [(-720) + 1247 - 247] = 12987

\(\Leftrightarrow\text{12987 -x- [280] = 12987}\)

\(\Leftrightarrow-x-280=0\Leftrightarrow x=-280\)