Question

решите пожалуста! задпние 15, 18, 20

Answer 1

15
1) х + 2, 971= 5, 317
х= 5, 317+ 2, 971
х =8, 288
___________
8 , 288 + 2, 971 = 5, 317

2) 12, 492 - х=7, 543
х=12, 492 - 7, 543
х= 4, 949
_____________
12, 492 - 4, 949 = 7, 543

3) х-72, 581=2, 143
х= 2, 143+72, 581
х= 74, 724
_____________
74, 724 - 72, 581 = 2, 143

4) 12, 371 + х = 19, 002
х= 19, 002 - 12, 371
х= 6, 631
_______________
12, 371 + 6, 631 = 19, 002