63 -( 25 + Z) =26
25 +Z = 63 - 26
25 +Z=37
Z=37 - 25
Z=12
проверка: 63 -(25 + 12) = 26
26 = 26
1. 1) <span>739 + 245 = 984
2) 31*29 = 899
3) 984:82 = 12
4) 12 + 899 = 911
2. 1) </span><span>469 - 398 = 71
</span><span> 2) 13*71 = 923
3) 42*21 =882
4) 882:63 =14
5) 923 - 14 = 909
<em> Вроде так.</em>
</span>
4х=81-33
4х=48
х=48:4
х=12
81-4*12=33