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a fost răspuns

Aflati valoarea lui x
1000-4×[100-3×(2×x-5):9]×2=240
Dau coroanA

Răspuns :

1000-4×[100-3×(2×x-5):9]=240:2=120
1000-4×[100-3×(2×x-5)]=120×9=1080
4×[100-3×(2×x-5)]=1080-1000=80
100-3×(2×x-5)=80:4=20
3×(2×x-5)=100-20=80
2×x-5=3×80
2×x-5=270
2x=270+5=275
2x=275
x=275:2