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Calculați: 1+3*[(57-60/4*2)/3+21]/10=?

Răspuns :

1+3*[(57-60/4*2)/3+21]/10=
1+3x[(57-30):3+21]:10=
1+3x[27:3+21]:10=
1+3x[9+21]:10=
1+3x30:10=
1+90:10=
1+9=10