daca se poate:
1) aratati ca numarul a=(x-3)la patrat – 2(x-3)(x+3)+(x+3)la patrat este natural oricare ai fi numarul x.
2) cum rationalizez fractia: 4/radical din 5 – 1
3) perimetrul unui triunghi echilateral este egal cu 12 cm. Inaltimea triunghiuliui are liungimea egala cu ?!
4) un trapez are bazele lungimi 6 cm , respectiv 10 cm. linia mijlocie a trapezului are lungimea egala cu ?!
5) 2x+3 totul /9 – 2/3 ori (x+2)= 2x-5 totul /18 + x/6 ; sa fie rezolvata in multimea nr reale.
MULTUMESC MULT.
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