I monomi e polinomi: esercizi con coefficienti interi

(1) $2x-(-3x)+(-5x)-y-(-y)$ $[0]$

(2) $-2a-(-3a)+4-(+b)-(-3b)-a-2b$ $[4]$

(3) $x^{2}+y^{2}+z^{2}-(-x^{2})+(-y^{2})-(+z^{2})-2x^{2}$ $[0]$

(4) $3a+3ab-10a-2ab-10a-2ab$ $[-7a+ab]$

(5) $2a^{2}-8a^{2}b+9a^{2}b+6a^{2}$ $[8a^{2}+a^{2}b]$

(6) $-xy-15x+7y+21xy$ $[20xy-15x+7y]$

(7) $a^{2}+7a^{2}b-4a^{2}-2ab^{2}-6a^{2}-5a^{2}b$ $[-9a^{2}+2a^{2}b-2ab^{2}]$

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