Question

Реши уравнения 1)405+х=1000-158 2) у-457=56+104 3) х-209=400-264 4) 239+у=800-197

Answer 1

1)
405+x = 842
x = 842 - 405
x = 437
2)
y-457=160
y=457+160
y=617
3)
x-209=136
x= 136+209
x=345
4)
239+ y=603
y=603-239
y = 364