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a fost răspuns

6×a-6=30-2×3; 924-(150+a)=100+2×100; n+(558÷9+30×15)=2142

Răspuns :

6xa-6=30-2x3
6xa-6=30-6
6xa-6=24
6xa=24+6
6xa=30
a=30:6
a=5

924-(150+a)=100+2x100
924-(150+a)=100+200
924-(150+a)=300
150+a=924-300
150+a=624
a=624-150
a= 474

n+(558:9+30x15)=2142
n+(62+450)=2142
n+512=2142
n=2142-512
n=1630

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