3. Вычисли удобным а) (7 +6) – 5
(4 + 8) - 3
(5 +6) — 4
(8 +7) – 6
(46 + 29) - 19
(67 + 24) – 37
б) (59 – 12) – 9
(42 +19) – 2
(25 + 36) – 6
(55 + 28) +5
(27 + 13) – 5
(12+88) — 50​

а) (7+6)-5= 6-5+7= 8 (6-5=1+7=8)

(4+8)-3= 4-3+8= 9 (4-3=1+8=9)

(5+6)-4=7(5-4=1+6=7)

(8+7)-6=9(7-6=1+8=9)

(46+29)-19=56(29-19=10+46)

(67+24)-37=54(67-37=30+24=54)

б) (59-12)-9=38(59-9=50-12=38)

(42+19)-2=59(42-2=40+19=59)

(25+36)-6=55(36-6=30+25=55)

(55+28)+5=88(55+5=60+28=88)

(27+13)-5=35(27+13=40-5=35)

(12+88)-50=50(12+88=100-50=50)