1) Tìm x
a)x : 13= -3
x = -3.13
x = -39
b)2x - (-17) =15
2x + 17=15
2x= 15-17
2x= -2
x= -2:2
x= -1
c) x-2= -3
x= -3+2
x= -1
2)
a) Ư(-8)={1;2;4;8;-1;-2;-4;-8}
b) 5 B(9)={0;9;18;27;36}
c) Ư(27)={1;3;9;27;-1;-3;-9;-27}
a) \(x:13=-3\)
\(x=-3.13\)
\(x=-39\)
b) \(2x-\left(-17\right)=15\)
\(2x=15-17\)
\(2x=-2\)
\(x=-1\)
c) \(x-2=-3\)
\(x=-3+2\)
\(x=-1\)
d) \(Ư\left(-8\right)\in\left\{\pm1;\pm2;\pm4;\pm8\right\}\)
e) \(B\left(9\right)\in\left\{0;9;18;27;36;....\right\}\)
g) \(Ư\left(27\right)\in\left\{\pm1;\pm3;\pm9;\pm27\right\}\)
hok tốt!!
x : 13 = -3
x = -3 . 13
x = - 39
Vẫy=-39
2x - (-17)= 15
2x + 17 = 15
2x = 15 - 17
2x = -2
x = -2 : 2
x = -1
Vậy x=-1
x - 2 = -3
x = -3 + 2
x = -1
Vậy x=-1