
Răspuns:
Explicaţie:
Răspuns:
Explicaţie:
Cum te multiplici (7z + 8x) (7z - 8x)?
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(7z + 8x) 7z * 7z-7z * 8x + 8x * 7z-8x * 8x 49z ^ 2-56zx + 56xz-64x ^ 2 49z ^ 2-64x ^ 2
Cum multiplici 7x ^ 2y (5x ^ 2-3xy + y)?
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35x4y-21x3yy2 + 7x ^ 2y ^ 2 7x ^ 2y (5x ^ 2-3xy + y) 35x ^ 4y-21x ^ 3y ^ 2 + 7x ^ 2y ^
Cum multiplici -8a ^ {3} b (7b ^ {2} - 5b + 18)?

5b) -8a ^ 3b (7b ^ 2-5b + 18) -8a ^ 3b * 7b ^ 2-8a ^ 3b * (-5b) -8a ^ 3b * 18 -56a ^ 3b ^ 3 + 40a ^ 3b ^ 2-144a ^ 3b