Question

Tính :

a) \(\left(+3\right).\left(+9\right)\)

b) \(\left(-3\right).7\)

c) \(13.\left(-5\right)\)

d) \(\left(-150\right).\left(-4\right)\)

e) \(\left(+7\right).\left(-5\right)\)

Answer 1

a) 27; b) -21; c) -65; d) 600; e) -35.

Answer 2

Sách Giáo Khoa

Tính:

a) (+3) . (+9); b) (-3) . 7; c) 13 . (-5);

d) (-150) . (-4); e) (+7) . (-5).

Bài giải:

a) 27; b) -21; c) -65; d) 600; e) -35.

Answer 3

a) 3+9=12

b)-3.7=-21

c)13.-5=-65

d)-150.-4=600

e)7.-5=-35

Answer 4

a) (+3). (+9)

= 27

b) (-3).7

= -(3.7)

= -21

c) 13.(-5)

= -(13.5)

= -65

d) (-150).(-4)

= 150.4

= 600

e) (+7).(-5)

= -(7.5)

= -35

Answer 5

a) 27;

b) -21;

c) -65;

d) 600;

e) -35.

Answer 6

a) 27;

b) -21;

c) -65;

d) 600;

e) -35.

Answer 7

a) 27;

b) -21;

c) -65;

d) 600;

e) -35.

Answer 8

a) (+3). (+9)

= 27

b) (-3).7

= -(3.7)

= -21

c) 13.(-5)

= -(13.5)

= -65

d) (-150).(-4)

= 150.4

= 600

e) (+7).(-5)

= -(7.5)

= -35