Question

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Answer 1

Răspuns:

Explicație pas cu pas:

probl 19.

a+b=262;

a=262-b;

a-38=1/3*b;

262-b-38=b/3;

786-3b-114=b;

-4b=114-786;

-4b=-672;

b=168;

a=262-168;

a=94;

probl 20.

a+m=1176;

a=1776-m;

a-325=m-128;

1776-m-325=m-128;

-m-m=-128+325-1776;

-2m=-1579;

m=789.5;

a=1776-789.5;

a=986.5;

probl 18

a+b+c+d=cele 4 nr consecutive impare;

a+b+c+d/9=68+4;

a+b+c+d=9*68+4;

a+b+c+d=612+4;

a+b+c+d=616;

616/4=154;

cifrele sunt 151,153,155,157;

adunate cifrele dau 616;

probl 17.

a+b+c=375;

2a=b+c;

a=b+c/2;

b=c+120;

b+c/2+c+120+c=375;

c+120+c/2+c+120+c=375;

c+120+c+2c+240+2c=750;

6c=750-240-120;

6c=390;

c=65;

b=65+120;

b=185;

a=185+65/2;

a=125;

probl 16;

c+m+p=86;

c=2m+8;

p=(c+m)-38;

2m+8+m+c+m-38=86;

4m+c=86+38-8;

4m+c=86+30;

4m+c=116;

c=2m+8;

4m+2m+8=116;

6m=116-8;

6m=108;

m=108/6;

m=18;

c=2*18+8;

c=44;

p=c+m-38;

p=44+18-38;p=24;