Question

B1/Tính nhanh:

1/ 5(-2-1)-3(2-5)

2/ 15(2-1)-3(4+2)

3/ -3(7-2)+5(4-3)

Answer 1

1/ 5(-2-1)-3(2-5)

=5.1-3.(-3)

=5-(-9)

=14

2/ 15(2-1)-3(4+2)

=15.1-3.8

=15-24

=-9

3/ -3(7-2)+5(4-3)

=-3.5+5.1

=-15+5

=-10

Answer 2

tick len 460 tui giai cho

Answer 3

1/ -6

2/ 1

3/ 20

Answer 4

1/=0

2/=(-3)

3/=(-10)

Answer 5

1/ 5(-2-1)-3(2-5)

=5.(-3)-3.(-3)

=(5-3)x(-3)

=2.(-3)

=-6

2/ 15(2-1)-3(4+2)

=15.1-3.8

=15-24

=-9

3/ -3(7-2)+5(4-3)

=-3.5+5.1

=-15+5

=-10

Answer 6

1/  =5(-3)-3(-3) =(5-3).(-3)=-6

2/  =15.1-3.6 =15-18 =-3

3/  =-3.5 +5.1 =-15 +5 =-10