-2,5х(4х-5)-(2-3х)(5х+1) упростить выражение
-2,5х(4х-5)-(2-3х)(5х+1) =( -2,5х*4х+2,5х*5)-(2*5х+2*1-3х*5х-3х*1) = =( -10х²+12,5х)-(5х+2-15х²-3х) = -10х²+12,5х - 5х - 2+15х²+3х = = (-10х² +15х²)+(12,5х - 5х+3х) - 2 = 5х² + 10,5х - 2