Question

va rog dau coroana!!!​

Answer 1

Explicație pas cu pas:

a=1/(1+2+3+...+10)

a=1/(11×5)

a=1/55

b=1/(1+2+3...+11)

b=1/(11×5+6)

b=1/61

a) bla puterea -1=

=61/1

=61

b)a/b=

=1/55÷1/61

=1/55×61/1

=61/55

c)-11(a-b)=

=-11(1/55-1/61)

=-11/55+11/61

d)22×(5a-6b)

=22*(5/55-6/61)

=110/55-132/61