ex 9 punctele a,c,e,g,h
va rog! (dau coroana!!!)
Răspunsuri la întrebare
Răspuns:
a) 570-(170-11•2)+23•22=. e)370•[30+17•3-(13•5+15)]-19•18=
=570-(170-22)+506= 370•[30+17•3-(65+15)]-19•18
=570-148+506= 370•(30+51-80)-342
=422+506=928. 370•(81-80)-342
370•1-342
370-342
=28
c)13•(4950-99•50)+15•7 g)13•7-(34•3-24•4)-15
=13•(4950-4950)+105. 13•7-(102-96)-15
=13•0+105=. 13•7-8-15
=0+105=105. 91-8-15
83-15
68
h)28•7+14•3+2•(54•2-26•4-1)
28•7+15•3+2•(108-104-1)
28•7+15•3+2•(2-1)
28•7+15•3+2•1
196+45+2
241+2
243