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A)4+[9-(8+ax6):10]x5 =39,a=?
B)(6 - a)x (3 + b)=10,a=?,b=?


Răspuns :

a) [9-(8+6a):10]×5=39-4
[9-(8+6a):10]×5=5
9-(8+6a):10=35:5
9-(8+6a):10=7
8+6a=9-7
8+6a=2
6a=2-8
6a= -6
a= -1


b) (6-1/3)×(3+b)=10
18+6b-1-1/3×b=10 amplificãm pe 6b cu 3
17+(18b-b)/3×b=10
17/3×b=10-17
17/3×b=-7
b= -7×3/17
b= -21/17
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Vezi imaginea CRISANEMANUEL
Vezi imaginea CRISANEMANUEL