3,7,8 и 47, 68, 81 .........
А) (6112 + 1596) - 496= 7708-496=7212
<span>б)(1823 + 846) - 1723= 2669-1723 =946
</span><span>в)95 837 - (95 137 + 198)=в)95 837 - 95 137 - 198=502
</span><span>г)(8593 + 1407) - 999=10000-999=9001 :)</span>
Г) (5a - 3b) - (2 + 5a - 3b) = 5a - 3b - 2 - 5a + 3b = (5a - 5a) + (3b - 3b) - 2 = 0 + 0 - 2 = - 2;
д) (1 - у) - (22у - 4) - 5 = 1 - у - 22у + 4 - 5 = (1 + 4 - 5) - (у + 22у) = 0 - 23у =
= - 23у;
е) 5b - (6b + a) - (a - 6b) = 5b - 6b - a - a + 6b = (5b - 6b + 6b) - (a + a) =
= 5b - 2a.