Question

Va rog
Sunt a6a și am uitat pe 1 l am facut va rog 2 3 4 5 una din ele ​

Answer 1

Răspuns:

a+b+c+d=1920

Explicație pas cu pas:

a+b+c+d=1920

a+b=384

a+b+c=896

b+c+d=1792

a+b+c+d=1920

b+c+d=1792

a+1792=1920

a=1920-1792

a=128

a+b+c+d=1920

a+b+c=896

896+d=1920

d=1920-896

d=1024

a+b+c+d=1920

a+b=384

d=1024

384+c+1024=1920

c=1920-1024-384

c=896-384

c=512

a+b=384

a=128

128+b=384

b=384-128

b=256

5. x×y=420 => y=420÷x

(x+5)×(y-2)=400

(x+5)×(420÷x-2)=400

420-2x+2100÷x-10=400

420-10-400=2x-2100÷x

2x-2100÷x=10 /÷2

x-1050÷x=5 /×x

x²-1050-5x=0

x²-5x-1050=0

delta=25+4×1050=25+4200=4225=65²

x1=(5-65)/2=-60÷2=-30

x2=(5+65)/2=70÷2=35

y=420÷x

y1=420÷30=14

y2=420/35=60/5=12