-3m+19m-15m-(-6m)=? x+0.65x+(-2,75)+(-0,65x)-x=?

№1

-3m + 19m - 15m - (-6m) = 16m - 15m - (-6m) = m - (-6m) = m + 6m = 7m.

Ответ: -3m + 19m - 15m - (-6m) = 7m.

№2

x + 0,65x + (-2,75) + (-0,65x) - x = 1,65х + (-2,75) + (-0,65x) - x = 1,65х - 2,75 + (-0,65x) - x = 1,65х + (-0,65x) - x - 2,75 = 1,65х - 0,65x - x - 2,75 = х - х - 2,75 = 0х - 2,75 = -2,75.

Ответ: x + 0,65x + (-2,75) + (-0,65x) - x = -2,75.