Question

b) 9a + 12b+7= 28, află 3a +4b;
d) 7a+ 14b +21 = 105, află 3a +6b;
f) 6a-12b-5=67, află 13+5a - 10b.
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Answer 1

Răspuns:

b} 9a+12b=28-7

9a+12b=21/÷3

3a+4b=7

d} 7a+14b+21=105/÷7

   a+2b+3=15

   a+2b=15-3

    a+2b=12/×3

    3a+6b=36

f} 6a-12b-5=67

6a-12b=72

a-2b=12/×5

5a-10b=60

5a-10b= 73-13

5a-10b +13=73

Explicație pas cu pas: