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456-(190×28-263×19)-7×a=9×10 +1

Răspuns :

AlexandruAlexutzu
456-(5320-2367)-7×a=90+1
456-2953-7•a=91
456-2963×a=91:7
456-2963×a=13
456•a=13+2963
456•a=2966
a=2966:456
a=6

456-(5360-4997)-7×a=91 456-373-7×a=91 183-7×a=91 7×a=183-91 7×a=92 a=92÷7 a=13