Răspuns :
x - 48 × 56 = 485
x - 2 688 = 485
x = 485 + 2 688
x = 3 173
______________
142 ×24 - x = 348
3 408 - x = 348
x = 3 408 - 348
x = 3 060
___________
25 × 57 + x = 2 000
1 425 + x = 2 000
x = 2 000 - 1 425
x = 575
x - 48 × 56 = 485
x - 2 688 = 485
x = 485 + 2 688
x = 3 173
______________
142 ×24 - x = 348
3 408 - x = 348
x = 3 408 - 348
x = 3 060
___________
25 × 57 + x = 2 000
1 425 + x = 2 000
x = 2 000 - 1 425
x = 575