Объяснение:
1.(2-в)(3-5в) = 2*3+2*(-5в)-в*3-в*(-5в) = 6-10в-3в+5в^2 = 6-7в+5в^2 = 5в^2-7в+6
2.(5в-в^2)(2+3в) = 5в*2+5в*3в-в^2*2-в^2*3в = 10в^2+15в^2-2в^2-3в^3 = -3в^3+23в^2
3.9-(3+а)(2а+3) = 9-3*2а+3*3+а*2а+а*3 = 9-6а+9+2а^2+а^3 = а^3 + 2а^2 - 6а
4.(1-2х)(2+х) = 1*2+1*х-2х*2-2х*х = 2+х-4х-2х^2 = -2х^2-4х+2
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Объяснение:
1.(2-в)(3-5в) = 2*3+2*(-5в)-в*3-в*(-5в) = 6-10в-3в+5в^2 = 6-7в+5в^2 = 5в^2-7в+6
2.(5в-в^2)(2+3в) = 5в*2+5в*3в-в^2*2-в^2*3в = 10в^2+15в^2-2в^2-3в^3 = -3в^3+23в^2
3.9-(3+а)(2а+3) = 9-3*2а+3*3+а*2а+а*3 = 9-6а+9+2а^2+а^3 = а^3 + 2а^2 - 6а
4.(1-2х)(2+х) = 1*2+1*х-2х*2-2х*х = 2+х-4х-2х^2 = -2х^2-4х+2