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Luisa057
a fost răspuns

Afla valoarea lui a :
a) 27: [26+(6×a-7×3): 9]+(13-2×2×3)=2
b) 5+[16-(9: a×8+7)]× 6=4: (1×2)+(3×3)
Va rog sa ma ajutati!!

Răspuns :

Deva
a)27:[26+(6xa-21):9]+(13-12)=2
27:[26+(6a-21):9]+1=2
27:[26+(6a-21):9]=2-1=1
26+(6a-21):9=27:1=27
(6a-21):9=27-26=1
6a-21=1x9=9
6a=9+21=30
a=30/6=5
b)5+[16-(9:ax8+7)]x6=4:2+9=2+9=11
[16-(9:ax8+7)]x6=11-5=6
16-(9:ax8+7)=6:6=1
9:ax8+7=16-1=15
9:ax8=15-7=8
9:a=8:8=1
a=1x9=9

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