I)1)3,5×2-4=7-4=3
2)A={6,9,12,15,18}
3)(2-3)×4-3+x=7
-1×4-3+x=7
-4-3+x=7
-7+x=-7
x=-7+7
x=0
4)37:6=6 rest 1
Restul este 1.
5)P=12cm
P=l+l+l=3l
3l=12
l=12:3
l=4 cm
II)2)a,b-nr.
ma=(a+b):2=28
[tex]a = \frac{3}{4} \times b[/tex]
[tex]a = \frac{3b}{4} [/tex]
[tex]ma = ( \frac{3b}{4} + b) \div 2 = 28[/tex]
[tex]ma = ( \frac{3b}{4} + \frac{4b}{4} ) \div 2 = 28 \: | \times 2[/tex]
[tex]ma = \frac{3b + 4b}{4} = 56[/tex]
[tex]ma = \frac{7b}{4} = 56[/tex]
[tex]7b = 56 \times 4[/tex]
[tex]7b = 224[/tex]
[tex]b = \frac{224}{7} [/tex]
[tex]b = 32[/tex]
[tex]a = \frac{3b}{4} [/tex]
[tex]a = \frac{3 \times 32}{4} [/tex]
[tex]a = \frac{96}{4} [/tex]
[tex]a = 24[/tex]
