(-5z^2+9z)+(10z^2-9z)= -5z^2+9z+10z^2-9z=5z^2. Ответ: 5z^2.
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(-5z^2+9z)+(10z^2-9z)= -5z^2+9z+10z^2-9z=5z^2. Ответ: 5z^2.