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# VII.21. (VIII.7) Calcule cu nr. reale exprimate prin litere

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1. Daca a %2b b = 3 si a - b = 10, atunci a² - b² = #
32x, educational activities , ,
2. CALCUL ALGEBRIC ATENTIE: pentru x² vei tasta x^2 pentru x³ vei tasta x^3 In casetele pentru raspunsuri tasteaza termenii fara spatiu intre ei, in ordinea descrescatoare a puterilor, in ordine alfabetica (a,b,...)(x,y,z,...)
-9a, , ,
3. Calculati 3a - 12a = #
4a%2bb%2b2ab, educational activities , multiple choice questions ,
4. Calculati 3x(x² %2b 2x - 3) - x²(2x %2b 1) - 4x %2b 5 = #
7a%2b2, , ,
5. Calculati (x %2b 3y)² = #
5b-6, , ,
6. Calculati (2 - a)b %2b 3(b - 2) %2b ab = #
-3x-8y%2b13z, , ,
7. Calculati 2(2a -1) %2b 3a %2b 4 = #
x-y%2b3xy%2b2, , ,
8. Calculati (2x - 1)² = #
4x^2-4x%2b1, , ,
9. Calculati 3a %2b 2b - 5ab %2b a - b %2b 7ab = #
x^2%2b6xy%2b9y^2, , ,
10. Calculati (x %2b 2y - 1)² = #
x^2%2b4y^2%2b4xy-2x-4y%2b1, , ,
11. Calculati x - 3x %2b12x - 23x %2b 45x = #
x^2-4y^2, , ,
12. Calculati (2 - x)(y %2b 1) %2b 2x - 3y %2b 4xy = #
30, , ,
13. Calculati (x %2b 2y)(x - 2y) = #
16, , educational games ,
14. Daca a = 2x - 3y %2b 5z - 4x si b = -x %2b 4y - 3z - 2y, atunci 2a - b = #
x^3%2b5x^2-13x%2b5, , ,