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100- [36+ 6 x 9- ( a: 3 + 15)] :3= 77​

Răspuns :

Mihaelagask

100-[36+6x9-(a:3+15)]:3=76

[36+6x9-(a:3+15)]:3=100-76

[36+6x9-(a:3+15)]:3=24

[36+6x9-(a:3+15)]=24x3

[36+6x9-(a:3+15)]=72

[36+54-(a:3+15)]=72

[90-(a:3+15)]=72

(a:3+15)=90-72

(a:3+15)=18

a:3=18-15

a:3=3

a=3x3

a=9

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