Question

vă dau coroane va rog frumos a,b d k,l ​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 2x(a+b) = 2x0 = 0

b) 7x(a-b) = 7x30 = 210

d) 2x(a+5b) = 2x43 = 86

k) 2019x(2018-18)-2000-2000x2017 =

2019x2000-2000-2000x2017 =

2000x(2019-1-2017) =

2000x1 = 2000

l) este greșeală de tipar ..... 2017 avem la inceput

2017x(2019-2018)+2018x(2020-2019) =

2017x1+2018x1 =

2017+2018 = 4035

Answer 2

Răspuns:

a) 2a+2b=2×(a+b), a+b=0 deci 2×(a+b)=2×0=0

b) 7a-7b=7×(a-b), a-b=30 deci 7×(a-b)=7×30=210

d) 2a+10b=2×(a+5b), a+5b=43 deci 2×(a+5b)=2×43=86

k) 2019×2018-18×2019-2000-2000×2017=

=2019×(2018-18)-2000×(1+2017)=

=2019×2000-2000×2018=

=2000×(2019-2018)=

=2000×1=2000

l)2017×2019-2018×2017+2018×2020-2019×2018=

=2017×(2019-2018)+2018×(2020-2019)=

=2017×1+2018×1=

=2017+2018=4035