a)
[tex]3 \times 5 + 7 \times a + 7 \times b = [/tex]
[tex]15 + 14 \times 13 = [/tex]
[tex]182 + 15 = 197[/tex]
b)
[tex]x \times a + x \times b - 50 = [/tex]
[tex]5 \times a + 5 \times b - 50 = [/tex]
[tex]10 \times 13 - 50 = [/tex]
[tex]130 - 50 = 80[/tex]
c)
[tex]10 \times x + (4 \times a + 4 \times b) = [/tex]
[tex]10 \times 5 + (4 \times a + 4 \times b) = [/tex]
[tex]50 + (8 \times 13) = [/tex]
[tex]50 + 104 = 154[/tex]
d)
[tex](4 \times a + 4 \times 6 - 2 \times x) \times (2 \times a + 2 \times 6 + x) = [/tex]
[tex](4 \times a + 24 - 10) \times (2 \times a + 12 + 5) = [/tex]
[tex]4 \times a + 24 -10 \times 2 \times a + 12 + 5 = [/tex]
[tex]4 \times a + 24 - 20 \times a + 12 + 5 = [/tex]
[tex]4 \times a + 4 \times a = 12 - 5[/tex]
[tex]8 \times 2 \times a = 7[/tex]
[tex]16 \times a = 7[/tex]
[tex]a = 16 - 7[/tex]
[tex]a = 9[/tex]
Sper că te-am fost de folos!!!
