( 4/9 - 5/12 ) - ( 3/8 - 4/9 ) решить срочно

( 4/9 - 5/12 ) - ( 3/8 - 4/9 )=

4/9-5/12-3/8+4/9=

4/9+4/9-(5/12+3/8)=

8/9-(10/24+9/24)=

8/9 -19/24=64/72 -57/72=7/72

( 4/9 - 5/12 ) - ( 3/8 - 4/9 )=24

1)4\9-5\12=16\36-15\36=1\36

2)3\8-4\9=27\72-32\72=-5\72

3)1/36-(-5/72)=2\72-(-5\72)=7\72