Question

Va rog sa ma ajutati dau coroană inima ​

Answer 1

Răspuns:

a+a/2=4,5 amplificam

2a+a=9

a=9:3

a=3

____________

a+a+1+a+2=54

3a+3=54

3a=54-3

a=51:3

a=17

17+1=18

17+2=19

nr sunt :17,18,19

___________

a-2a/5=37+23 amplificam

5a-2a=185+115

3a=300

a=300:3

a=100

____________

a-3a/4+18=a/2 amplificam

4a-3a+72=2a

a=72

Answer 2

Răspuns:

Explicație pas cu pas:

$ex11. x+\frac{1}{2}*x=4,5, \frac{2}{2}x+ \frac{1}{2}*x=4\frac{1}{2} , \frac{3}{2}x=\frac{3}{2},\\x=\frac{9}{2}:\frac{3}{2}=\frac{9}{2}*\frac{2}{3}=3\\ex 12\\x+x+1+x+2=54, 3x=54-3, x=51:3=17.\\17; 18; 19\\ex 13\\x-\frac{2}{5}x=37+23, \frac{5}{5}x-\frac{2}{5}x=60, \frac{3}{5}x=60, x=60:\frac{3}{5}=60*\frac{5}{3}=100\\ex 14\\x-\frac{3}{4}x+18=\frac{1}{2}x, \frac{4}{4}x-\frac{3}{4}x+18=\frac{2}{4}x,\\\frac{4}{4}x-\frac{3}{4}x-\frac{2}{4}x=-18, -\frac{1}{4}x=-18, x=-18:-\frac{1}{4}=-18*(-4)=72\\x=72$