Question

Va rog sa ma ajutati cu aceste exercitii deoarece astazi am invatat despre termenii necunoscuti ( cum se afla mai jos)1. (64 - 3 x 8 - 5 x a ) : 2 =10

2. (6 - 30 : a + 5 x 5) : 5 = 5

3. (13 - 3 x 4) x18 :6 = 6 - a : 9 

4. ( a + 6 x 2 +9 x 5 ) - 2 x ( 17 -7 ) = 2 x 5 + 6 x 5

Va multumesc!

Answer 1

1)(64-3*8-5*a):2=10
64-24-5*a=10*2
40-5*a=20
5a=40-20
5a=20
a=20:5
a=4
    S={4}

2)(6-30:a+5*5):5=5
6-30:a+25=5*5
6-30:a+25=25
6-30:a=25-25
6-30:a=0
30:a=6-0
30:a=6
a=30:6
a=5
   S={5}

3)(13-3*4)*18:6=6-a:9
3=6-a:9
6-3=a:9
3=a:9
a=3*9
a=27
    S={27}

4)(a+6*2+9*5)-2*(17-7)=2*5+6*5
(a+12+45)-2*10=10+30
(a+57)-20=40
a+57=40+20
a+57=60
a=60-57
a=3
   S={3}

Answer 2

$1.(64-3*8-5*a):2=10\\ (64-24-5a)=10*2\\ 40-5a=20\\ 5a=40-20\\ 5a=20\\ a=20:5\\ \boxed{a=4}.$

$2.(6-30:a+5*5):5=5\\ (6-30:a+25)=5*5\\ 6-30:a+25=25\\ 6-30:a=25-25\\ 6-30:a=0\\ 30:a=6+0\\ 30:a=6\\ a=30:6\\ \boxed{a=5}.$

$(13-3*4)*18:6=6-a:9\\ 3=6-a:9\\ 6-3=a:9\\ 3=a:9\\ a=3*9\\ \boxed{=27}$

[tex](a+6*2+9*5)-2*(17-7)=2*5+6*5\\ (a+12+45)-2*10=10+30\\ (a+57)-20=40\\ a+57=40+20\\ a+57=60\\ a=60-57\\ \boxed{a=3}. [/tex]