а) 4х-5у-10х+у = (4х-10х) + (-5у+у) = -6х-4уб) 3*(2а+1)-3 = 6а + 3 - 3 = 6ав) 12х-(х-2)+(2х+5) = 12х - х + 2 + 2х + 5 = 13х + 7
2) При а = 2:2(2,5a-1,5)+5,5a-8 = 2(2,52-1,5) + 5,52 - 8 = 2(5-1,5) + 11 - 8 = 23,5 + 3 = 7 + 3 = 10
а) 4х-5у-10х+у = (4х-10х) + (-5у+у) = -6х-4у
б) 3*(2а+1)-3 = 6а + 3 - 3 = 6а
в) 12х-(х-2)+(2х+5) = 12х - х + 2 + 2х + 5 = 13х + 7
2) При а = 2:
2(2,5a-1,5)+5,5a-8 = 2(2,52-1,5) + 5,52 - 8 = 2(5-1,5) + 11 - 8 = 23,5 + 3 = 7 + 3 = 10