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a fost răspuns

[x*3-3]*9=306
[x*2]*3=30*3
[7*9-x*5]-9/3=20
909/9-[9*9/x-9]=101
/=semnul impartirii
*=semnul inmultirii

Răspuns :

AlexandraMaria2004
1)x*3-3=306:9
x*3-3=34
x*3=34+3
x*3=37
x=37:3
x=12,5

2)[x*2]*3=30
x*2=30:3
x*2=10
x=10:2
x=5

3)[7*9-x*5]-9=20*3
[7*9-x*5]-9=60
7*9-x*5=60+9
7*9-x*5=69
63-x=69:5
63-x=13,8
x=13,8+63
x=76,8