27+×=90 90-×=63 ×-27=63

Question

27+×=90 90-×=63 ×-27=63

Answer 1

1)
27 + х = 90
х = 90 - 27
х = 63
проверка:
27 + 63 = 90
90 = 90

2)
90 - х = 63
х = 90 - 63
х = 27
проверка:
90 - 27 = 63
63 = 63

3)
х - 27 = 63
х = 63 + 27
х = 90
проверка:
90 - 27 = 63
63 = 63

Answer 2

27+x=90
x=90-27
x=63
27+63=90

90-x=63
x=90-63
x=27
90-27=63

x-27=63
x=63+27
x=90
90-27=63