Question

Ex. 9,11 varog frumos am nevoie urgent dau coroana

Answer 1

Explicație pas cu pas:

9.

a) 4x+26x-7x+2x=

4•14+26•14-7•14+2•14=

56+364-98+28=

=350

b)

41a-8a-13a+13a=

41•101-8•101-13•101+13•101=

=4141-808-1313+1313

=3333

c)

19x+24x-16+x=

=19•11+24•11-16+11

=209+264-16+11

=468

d)

22-5x-x-4=

=22-0-0-4

=28

e)

3a•2b=

=3•5•2•10

=15•2•10

=30•10

=300

f)

12x•4y•3=

=(12•2)•(4•3)•3

=24•12•3

=864

11)

a)

9•3=27+3=30

b)

7+3=10•3=30

c)

84-3=81:3=27+3=30