Question

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Answer 1

Răspuns:

21. 67:[100-(a:3-9)-22]=1

67:(100-a:3+9-22)=1

67:(87-a:3)=1

87-a:3=67 a:3=87-67=20

a=20×3==60

22. 1+2×(6+a/3)-5=2×6

2(6+a/3)=12-1+5=16

6+a/3=16:2

a/3=8-6=2

a=2×3=6

23. 2×[2+3×(2+404:a)-612:6]=420-2

2+3(2+404:a)-612:6=418:2

3(2+404:a)=209-2+102

3(2+404:a)=309. /:3

2+404:a=103

404:a=101

a=404:101

a=4