1. х = 3/10
2. х = 5/12
Пошаговое объяснение:
1) х+9/20=3/4
х = 3/4 - 9/20
х = (3*5)/(4*5) - 9/20
х = 15/20 - 9/20
х = 6/20
х = 3/10
2)25/36-х = 5/18
х = 25/36 - 5/18
х = 25/36 - (5*2)/(18*2)
х = 25/36 - 10/36
х = 15/36
х = 5/12
1. х = 3/10
2. х = 5/12
Пошаговое объяснение:
1) х+9/20=3/4
х = 3/4 - 9/20
х = (3*5)/(4*5) - 9/20
х = 15/20 - 9/20
х = 6/20
х = 3/10
2)25/36-х = 5/18
х = 25/36 - 5/18
х = 25/36 - (5*2)/(18*2)
х = 25/36 - 10/36
х = 15/36
х = 5/12