Question

Plss dau coroana macar 2 sau 3 ex

Answer 1

18)a=56+ b
(a+ b):( a- b)=14 rest28
(56+ b+ b):(56+ b- b)=14 rest 28
(56+2 b):56=14 rest 28
56+2 b=14×56+28
56+2 b=784+28
2 b=812-56
b=756:2
b=378
a=56+378
a=434
21) prima zi:40% din x=40 x/100
a doua zi:30% din x=30 x/100
a treia zi:18 km
40 x/100+30 x/100+18= x
70 x/100+18= x
18= x-70 x/100
18=30 x/100
30 x=18×100
X=1800:30
X=60 km
Răspuns:60 km