=-3/4÷[(-6)*(-4/9)]

=-3/4÷8/3

=-3/4*3/8

=-9/32

(5 out of 12-7 out of18) ÷ (5 out of 36)

=(5/ 12-7/ 18)÷(-5/36)

=5/ 12*(-36/5)+7/ 18*36/5

=-3+ 14/5

=- 1/5

2: 1 ÷ (-2: 3)

= 1/2*(-2/3)

=- 1/3

(-1 .25) 4 o'clock1

=-5/4*4

=-5

7/3 (-0.35)

=7/3÷(-7/20)

=7/3*(-20/7)

=-20/3

(-3.5) 7 out of 8 (4 out of-3)

=-7/2÷[7/8*(-3/4)]

=-7/2÷(-2 1/32)

=-7/2*(-32/2 1)

= 16/3

(- 1/4)÷(-2/3)÷(-5/8)

=- 1/4÷(2/3*5/8)

=- 1/4÷5/ 12

=- 1/4* 12/5

=-3/5

(- 189)÷(-9)÷7

=- 189÷(-9*7)

= 189÷63

=3

(-0.75)÷65438+5/06÷(- 1.2)

=-3/4÷(-6/5*5/ 16)

=-3/4÷(-3/8)

=3/4*8/3

=2