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1) Determinati toate numerele naturale de forma 57x divizibile cu 2.
2) Determinati toate numerele naturale de forma 23xx divizibile cu 5.

3) Determinati toate numerele naturale de forma 7x4 divizibile cu 3. Care dintre ele se divid si cu 9??.

4) Determinati toate numerele naturale de forma 12x6 divizibile cu 9.

5) a) 26-12:2+15x4-13+18:9-44=

b) 9+7x3-42:6-54:9-68:4=

c) (15-10:2):5+(15+7x3):(14+4)=

d) (5x3-6x2)x(2x4+3)-(9-7)x(8:2-2+9)=

e) (5x3-6x2)x(2x4+3)-(9-7)x(8:2-2+9)=

f) [(3+5x8-48:4)-(2x7+5-78:6)-4]:7=

g) [6x5+5x(4+5)]:3-(11-3)x(24-21)=

1)572;574;578;571
2)2300;2355;2311
3)734;764;794;714
cu nouă se divide numărul ,,794"
4)1296;1216
5)a)26-12:2+15×4-13+18:9-44=
=26-6+60-13+2-44=
=20+60-13+2-44=
=80-15-44=
=65-44=
=21
mai continui tu,e usor

Answer Link

Nitugheorghe57 Nitugheorghe57 · Answer 2 · 2016-02-27T22:00:44+02:00

5)a)26÷2+15×4-13+18÷9-44=
26-6+60-13+2-44=
20+47+2-44=
67+2-44=25

b)9+7×3-42÷6-54÷9-68÷4=
9+21-7-6-17=
30-7-6-17=0

c)(15-10÷2)÷5+(15+7×3)÷(14+4)=
(15-5)÷5+(15+21)÷(18)=
(10÷5)+(36÷18)=
2+2=4

d)(5×3-6×2)×(2×4+3)-(9-7)×(8÷2-2+9)=
(15-12)×(8+3)-2×(4-2+9)=
(3×11)-(2×11)=33-22=11

e)[(3+5×8-48÷4)-(2×7+5-78÷6)-4]÷7=
[(3+40-12)-(14+5-13)-4]÷7=
(31-6-4)÷7=21÷7=3

g)[6×5+5×(4+5)]÷3-(11-3)×(24-21)=
[(30+5×9)÷3-8×3=
(30+45)÷3-24=
75÷3-24=25-24=1
sucees